pinctrl: rockchip: missing unlock on error in rockchip_set_pull()

We need to unlock here before returning -EINVAL.

Fixes: 6ca5274d1d12 ('pinctrl: rockchip: add rk3188 specifics')

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.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 fe2ec1b..46dddc15 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -504,6 +504,7 @@
 			data |= (3 << bit);
 			break;
 		default:
+			spin_unlock_irqrestore(&bank->slock, flags);
 			dev_err(info->dev, "unsupported pull setting %d\n",
 				pull);
 			return -EINVAL;