drm/nouveau/hwmon: remove some redundant checks

No need to check "ret" twice in a row.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_hwmon.c

@@ -587,19 +587,15 @@ nouveau_hwmon_init(struct drm_device *dev)
 
 	/* set the default attributes */
 	ret = sysfs_create_group(&hwmon_dev->kobj, &hwmon_default_attrgroup);
-	if (ret) {
 	if (ret)
 		goto error;
-	}
 
 	/* if the card has a working thermal sensor */
 	if (therm->temp_get(therm) >= 0) {
 		ret = sysfs_create_group(&hwmon_dev->kobj, &hwmon_temp_attrgroup);
-		if (ret) {
 		if (ret)
 			goto error;
 	}
-	}
 
 	/* if the card has a pwm fan */
 	/*XXX: incorrect, need better detection for this, some boards have