staging: mt7621-gpio: change 'to_mediatek_gpio' to make just a one line return

Function to_mediatek_gpio can directly return without declaring
anything else in its body improving readability. Also change
pointer '*' declaration to be with return type in the upper line.
Signed-off-by: NSergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NNeilBrown <neil@brown.name>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-gpio/gpio-mt7621.c

@@ -47,14 +47,10 @@ struct mtk_data {
 	struct mtk_gc *gc_map[MTK_BANK_CNT];
 };
 
-static inline struct mtk_gc
-*to_mediatek_gpio(struct gpio_chip *chip)
+static inline struct mtk_gc *
+to_mediatek_gpio(struct gpio_chip *chip)
 {
-	struct mtk_gc *mgc;
-
-	mgc = container_of(chip, struct mtk_gc, chip);
-
-	return mgc;
+	return container_of(chip, struct mtk_gc, chip);
 }
 
 static inline void