pinctrl: nsp-gpio: forever loop in nsp_gpio_get_strength()

There is a signedness bug here so the loop will never exit.

Fixes: 8bfcbbbcab ('pinctrl: nsp: add gpio-a driver support for Broadcom NSP SoC')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/pinctrl-nsp-gpio.c

@@ -439,9 +439,10 @@ static int nsp_gpio_set_strength(struct nsp_gpio *chip, unsigned gpio,
 static int nsp_gpio_get_strength(struct nsp_gpio *chip, unsigned gpio,
 				 u16 *strength)
 {
-	unsigned int i, offset, shift;
+	unsigned int offset, shift;
 	u32 val;
 	unsigned long flags;
+	int i;
 
 	offset = NSP_GPIO_DRV_CTRL;
 	shift = gpio;