power: supply: test-power: revise parameter printing to use sprintf

Simplify code by using sprintf instead of strcpy+strcat+strlen.
Signed-off-by: Harley A.W. Lorenzo <hl1998@protonmail.com>
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/test_power.c

@@ -352,9 +352,8 @@ static int param_set_ac_online(const char *key, const struct kernel_param *kp)
 
 static int param_get_ac_online(char *buffer, const struct kernel_param *kp)
 {
-	strcpy(buffer, map_get_key(map_ac_online, ac_online, "unknown"));
-	strcat(buffer, "\n");
-	return strlen(buffer);
+	return sprintf(buffer, "%s\n",
+			map_get_key(map_ac_online, ac_online, "unknown"));
 }
 
 static int param_set_usb_online(const char *key, const struct kernel_param *kp)
@@ -366,9 +365,8 @@ static int param_set_usb_online(const char *key, const struct kernel_param *kp)
 
 static int param_get_usb_online(char *buffer, const struct kernel_param *kp)
 {
-	strcpy(buffer, map_get_key(map_ac_online, usb_online, "unknown"));
-	strcat(buffer, "\n");
-	return strlen(buffer);
+	return sprintf(buffer, "%s\n",
+			map_get_key(map_ac_online, usb_online, "unknown"));
 }
 
 static int param_set_battery_status(const char *key,
@@ -381,9 +379,8 @@ static int param_set_battery_status(const char *key,
 
 static int param_get_battery_status(char *buffer, const struct kernel_param *kp)
 {
-	strcpy(buffer, map_get_key(map_status, battery_status, "unknown"));
-	strcat(buffer, "\n");
-	return strlen(buffer);
+	return sprintf(buffer, "%s\n",
+			map_get_key(map_ac_online, battery_status, "unknown"));
 }
 
 static int param_set_battery_health(const char *key,
@@ -396,9 +393,8 @@ static int param_set_battery_health(const char *key,
 
 static int param_get_battery_health(char *buffer, const struct kernel_param *kp)
 {
-	strcpy(buffer, map_get_key(map_health, battery_health, "unknown"));
-	strcat(buffer, "\n");
-	return strlen(buffer);
+	return sprintf(buffer, "%s\n",
+			map_get_key(map_ac_online, battery_health, "unknown"));
 }
 
 static int param_set_battery_present(const char *key,
@@ -412,9 +408,8 @@ static int param_set_battery_present(const char *key,
 static int param_get_battery_present(char *buffer,
 					const struct kernel_param *kp)
 {
-	strcpy(buffer, map_get_key(map_present, battery_present, "unknown"));
-	strcat(buffer, "\n");
-	return strlen(buffer);
+	return sprintf(buffer, "%s\n",
+			map_get_key(map_ac_online, battery_present, "unknown"));
 }
 
 static int param_set_battery_technology(const char *key,
@@ -429,10 +424,9 @@ static int param_set_battery_technology(const char *key,
 static int param_get_battery_technology(char *buffer,
 					const struct kernel_param *kp)
 {
-	strcpy(buffer,
-		map_get_key(map_technology, battery_technology, "unknown"));
-	strcat(buffer, "\n");
-	return strlen(buffer);
+	return sprintf(buffer, "%s\n",
+			map_get_key(map_ac_online, battery_technology,
+					"unknown"));
 }
 
 static int param_set_battery_capacity(const char *key,