pinctrl: mvebu: Delete an unnecessary return statement in mvebu_pinconf_group_dbg_show()

The script "checkpatch.pl" pointed information out like the following.

WARNING: void function return statements are not generally useful

Thus remove such a statement in the affected function.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/mvebu/pinctrl-mvebu.c

@@ -224,7 +224,6 @@ static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
 		}
 		seq_printf(s, " ]");
 	}
-	return;
 }
 
 static const struct pinconf_ops mvebu_pinconf_ops = {