staging: mt7621-gpio: avoid locking in mediatek_gpio_get_direction

mediatek_gpio_get_direction function is holding across a simple read
which it seems to be not neccessary at all. Just remove this locking
cleaning code of this function a bit.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -129,12 +129,7 @@ static int
 mediatek_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
 {
 	struct mtk_gc *rg = to_mediatek_gpio(chip);
-	unsigned long flags;
-	u32 t;
-
-	spin_lock_irqsave(&rg->lock, flags);
-	t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
-	spin_unlock_irqrestore(&rg->lock, flags);
+	u32 t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
 
 	return (t & BIT(offset)) ? 0 : 1;
 }