hwmon: (w83627ehf) make sensor_dev_attr_##_name variables static

Fix sparse warning:

drivers/hwmon/w83627ehf.c:1202:1: warning:
	symbol 'sensor_dev_attr_pwm1_target' was not declared. Should it be static?

and many more similar messages.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Link: https://lore.kernel.org/r/20191213015605.172472-1-chenzhou10@huawei.com
[groeck: Dropped all but one log message from description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/w83627ehf.c

@@ -1199,22 +1199,22 @@ store_tolerance(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
-SENSOR_DEVICE_ATTR(pwm1_target, 0644, show_target_temp,
+static SENSOR_DEVICE_ATTR(pwm1_target, 0644, show_target_temp,
 	    store_target_temp, 0);
-SENSOR_DEVICE_ATTR(pwm2_target, 0644, show_target_temp,
+static SENSOR_DEVICE_ATTR(pwm2_target, 0644, show_target_temp,
 	    store_target_temp, 1);
-SENSOR_DEVICE_ATTR(pwm3_target, 0644, show_target_temp,
+static SENSOR_DEVICE_ATTR(pwm3_target, 0644, show_target_temp,
 	    store_target_temp, 2);
-SENSOR_DEVICE_ATTR(pwm4_target, 0644, show_target_temp,
+static SENSOR_DEVICE_ATTR(pwm4_target, 0644, show_target_temp,
 	    store_target_temp, 3);
 
-SENSOR_DEVICE_ATTR(pwm1_tolerance, 0644, show_tolerance,
+static SENSOR_DEVICE_ATTR(pwm1_tolerance, 0644, show_tolerance,
 	    store_tolerance, 0);
-SENSOR_DEVICE_ATTR(pwm2_tolerance, 0644, show_tolerance,
+static SENSOR_DEVICE_ATTR(pwm2_tolerance, 0644, show_tolerance,
 	    store_tolerance, 1);
-SENSOR_DEVICE_ATTR(pwm3_tolerance, 0644, show_tolerance,
+static SENSOR_DEVICE_ATTR(pwm3_tolerance, 0644, show_tolerance,
 	    store_tolerance, 2);
-SENSOR_DEVICE_ATTR(pwm4_tolerance, 0644, show_tolerance,
+static SENSOR_DEVICE_ATTR(pwm4_tolerance, 0644, show_tolerance,
 	    store_tolerance, 3);
 
 /* Smart Fan registers */
@@ -1291,35 +1291,35 @@ store_##reg(struct device *dev, struct device_attribute *attr, \
 
 fan_time_functions(fan_stop_time, FAN_STOP_TIME)
 
-SENSOR_DEVICE_ATTR(pwm4_stop_time, 0644, show_fan_stop_time,
+static SENSOR_DEVICE_ATTR(pwm4_stop_time, 0644, show_fan_stop_time,
 	    store_fan_stop_time, 3);
-SENSOR_DEVICE_ATTR(pwm4_start_output, 0644, show_fan_start_output,
+static SENSOR_DEVICE_ATTR(pwm4_start_output, 0644, show_fan_start_output,
 	    store_fan_start_output, 3);
-SENSOR_DEVICE_ATTR(pwm4_stop_output, 0644, show_fan_stop_output,
+static SENSOR_DEVICE_ATTR(pwm4_stop_output, 0644, show_fan_stop_output,
 	    store_fan_stop_output, 3);
-SENSOR_DEVICE_ATTR(pwm4_max_output, 0644, show_fan_max_output,
+static SENSOR_DEVICE_ATTR(pwm4_max_output, 0644, show_fan_max_output,
 	    store_fan_max_output, 3);
-SENSOR_DEVICE_ATTR(pwm4_step_output, 0644, show_fan_step_output,
+static SENSOR_DEVICE_ATTR(pwm4_step_output, 0644, show_fan_step_output,
 	    store_fan_step_output, 3);
 
-SENSOR_DEVICE_ATTR(pwm3_stop_time, 0644, show_fan_stop_time,
+static SENSOR_DEVICE_ATTR(pwm3_stop_time, 0644, show_fan_stop_time,
 	    store_fan_stop_time, 2);
-SENSOR_DEVICE_ATTR(pwm3_start_output, 0644, show_fan_start_output,
+static SENSOR_DEVICE_ATTR(pwm3_start_output, 0644, show_fan_start_output,
 	    store_fan_start_output, 2);
-SENSOR_DEVICE_ATTR(pwm3_stop_output, 0644, show_fan_stop_output,
+static SENSOR_DEVICE_ATTR(pwm3_stop_output, 0644, show_fan_stop_output,
 		    store_fan_stop_output, 2);
 
-SENSOR_DEVICE_ATTR(pwm1_stop_time, 0644, show_fan_stop_time,
+static SENSOR_DEVICE_ATTR(pwm1_stop_time, 0644, show_fan_stop_time,
 	    store_fan_stop_time, 0);
-SENSOR_DEVICE_ATTR(pwm2_stop_time, 0644, show_fan_stop_time,
+static SENSOR_DEVICE_ATTR(pwm2_stop_time, 0644, show_fan_stop_time,
 	    store_fan_stop_time, 1);
-SENSOR_DEVICE_ATTR(pwm1_start_output, 0644, show_fan_start_output,
+static SENSOR_DEVICE_ATTR(pwm1_start_output, 0644, show_fan_start_output,
 	    store_fan_start_output, 0);
-SENSOR_DEVICE_ATTR(pwm2_start_output, 0644, show_fan_start_output,
+static SENSOR_DEVICE_ATTR(pwm2_start_output, 0644, show_fan_start_output,
 	    store_fan_start_output, 1);
-SENSOR_DEVICE_ATTR(pwm1_stop_output, 0644, show_fan_stop_output,
+static SENSOR_DEVICE_ATTR(pwm1_stop_output, 0644, show_fan_stop_output,
 	    store_fan_stop_output, 0);
-SENSOR_DEVICE_ATTR(pwm2_stop_output, 0644, show_fan_stop_output,
+static SENSOR_DEVICE_ATTR(pwm2_stop_output, 0644, show_fan_stop_output,
 	    store_fan_stop_output, 1);
 
 
@@ -1327,17 +1327,17 @@ SENSOR_DEVICE_ATTR(pwm2_stop_output, 0644, show_fan_stop_output,
  * pwm1 and pwm3 don't support max and step settings on all chips.
  * Need to check support while generating/removing attribute files.
  */
-SENSOR_DEVICE_ATTR(pwm1_max_output, 0644, show_fan_max_output,
+static SENSOR_DEVICE_ATTR(pwm1_max_output, 0644, show_fan_max_output,
 	    store_fan_max_output, 0);
-SENSOR_DEVICE_ATTR(pwm1_step_output, 0644, show_fan_step_output,
+static SENSOR_DEVICE_ATTR(pwm1_step_output, 0644, show_fan_step_output,
 	    store_fan_step_output, 0);
-SENSOR_DEVICE_ATTR(pwm2_max_output, 0644, show_fan_max_output,
+static SENSOR_DEVICE_ATTR(pwm2_max_output, 0644, show_fan_max_output,
 	    store_fan_max_output, 1);
-SENSOR_DEVICE_ATTR(pwm2_step_output, 0644, show_fan_step_output,
+static SENSOR_DEVICE_ATTR(pwm2_step_output, 0644, show_fan_step_output,
 	    store_fan_step_output, 1);
-SENSOR_DEVICE_ATTR(pwm3_max_output, 0644, show_fan_max_output,
+static SENSOR_DEVICE_ATTR(pwm3_max_output, 0644, show_fan_max_output,
 	    store_fan_max_output, 2);
-SENSOR_DEVICE_ATTR(pwm3_step_output, 0644, show_fan_step_output,
+static SENSOR_DEVICE_ATTR(pwm3_step_output, 0644, show_fan_step_output,
 	    store_fan_step_output, 2);
 
 static ssize_t