pinctrl: use ERR_CAST instead of ERR_PTR/PTR_ERR

Inspired by scripts/coccinelle/api/err_cast.cocci
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

include/linux/pinctrl/consumer.h

@@ -142,7 +142,7 @@ static inline struct pinctrl * __must_check pinctrl_get_select(
 	s = pinctrl_lookup_state(p, name);
 	if (IS_ERR(s)) {
 		pinctrl_put(p);
-		return ERR_PTR(PTR_ERR(s));
+		return ERR_CAST(s);
 	}
 
 	ret = pinctrl_select_state(p, s);