pinctrl: ma35: Use int type to store negative error codes

Change the 'ret' variable in ma35_pinctrl_parse_functions() from u32 to
int, as it needs to store either negative error codes or zero returned
by ma35_pinctrl_parse_groups().

No effect on runtime.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/nuvoton/pinctrl-ma35.c

@@ -1038,7 +1038,8 @@ static int ma35_pinctrl_parse_functions(struct fwnode_handle *fwnode, struct ma3
 	struct group_desc *grp;
 	static u32 grp_index;
 	const char **groups;
-	u32 ret, i = 0;
+	u32 i = 0;
+	int ret;
 
 	dev_dbg(npctl->dev, "parse function(%d): %s\n", index, np->name);