pinctrl: abx500: get rid of unused variable

commit 2fcea6c
"pinctrl: remove remaining users of gpiochip_remove() retval"
removed the use of the return value from gpiochip_remove()
but missed to delete the dangling "err" variable:

drivers/pinctrl/nomadik/pinctrl-abx500.c:
In function 'abx500_gpio_probe':
drivers/pinctrl/nomadik/pinctrl-abx500.c:1208:11:
warning: unused variable 'err' [-Wunused-variable]

Fix this by getting rid of the dangling variable.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/nomadik/pinctrl-abx500.c

@@ -1206,7 +1206,7 @@ static int abx500_gpio_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	struct abx500_pinctrl *pct;
 	unsigned int id = -1;
-	int ret, err;
+	int ret;
 	int i;
 
 	if (!np) {