drivers: sensor: explorir_m: fix maybe-uninitialized

Fix maybe-uninitialized warning by initializing `restore-rc`.

Signed-off-by: Jeppe Odgaard <[email protected]>

Author: Jeppe Odgaard

drivers/sensor/explorir_m/explorir_m.c

@@ -262,7 +262,7 @@ static int explorir_m_calibrate(const struct device *dev, struct sensor_value *v
 	struct explorir_m_data *data = dev->data;
 	struct sensor_value original;
 	struct sensor_value tmp;
-	int restore_rc;
+	int restore_rc = 0;
 	int rc;
 
 	/* Prevent sensor interaction while using calibration filter value */