pinctrl: rockchip: Add missing irq_gc_unlock() call before return error

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 427564f..1eb5a2e 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1035,6 +1035,7 @@
 		polarity &= ~mask;
 		break;
 	default:
+		irq_gc_unlock(gc);
 		return -EINVAL;
 	}