pinctrl: imx: fix assigning groups names

This fixes regression caused by incorrect array indexing.
Reported-by: Fabio Estevam <festevam@gmail.com>
Fixes: 02f11713 ("pinctrl: imx: prepare for making "group_names" in "function_desc" const")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Tested-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20211227122237.6363-1-zajec5@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-imx.c

@@ -649,7 +649,7 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
 	struct function_desc *func;
 	struct group_desc *grp;
 	const char **group_names;
-	u32 i = 0;
+	u32 i;
 
 	dev_dbg(pctl->dev, "parse function(%d): %pOFn\n", index, np);
 
@@ -669,10 +669,12 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
 				   sizeof(char *), GFP_KERNEL);
 	if (!group_names)
 		return -ENOMEM;
+	i = 0;
 	for_each_child_of_node(np, child)
-		group_names[i] = child->name;
+		group_names[i++] = child->name;
 	func->group_names = group_names;
 
+	i = 0;
 	for_each_child_of_node(np, child) {
 		grp = devm_kzalloc(ipctl->dev, sizeof(struct group_desc),
 				   GFP_KERNEL);