pinctrl: rockchip: Simplify locking with scoped_guard()

Simplify error handling by removing two mutex_unlock() calls with
scoped_guard().

Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

Author: krzk

drivers/pinctrl/pinctrl-rockchip.c

@@ -3640,17 +3640,16 @@ static int rockchip_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 			 * The lock makes sure that either gpio-probe has completed
 			 * or the gpio driver hasn't probed yet.
 			 */
-			mutex_lock(&bank->deferred_lock);
-			if (!gpio || !gpio->direction_output) {
-				rc = rockchip_pinconf_defer_pin(bank, pin - bank->pin_base, param,
-								arg);
-				mutex_unlock(&bank->deferred_lock);
-				if (rc)
-					return rc;
-
-				break;
+			scoped_guard(mutex, &bank->deferred_lock) {
+				if (!gpio || !gpio->direction_output) {
+					rc = rockchip_pinconf_defer_pin(bank,
+									pin - bank->pin_base,
+									param, arg);
+					if (rc)
+						return rc;
+					break;
+				}
 			}
-			mutex_unlock(&bank->deferred_lock);
 		}
 
 		switch (param) {