pinctrl: fix a memleak when freeing maps

We forgot to free the node itself when free:ing a map.

Reported-by: xulinuxkernel <[e-mail]>
Reviewed-by: Stephen Warren <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/core.c

···
 	list_for_each_entry(maps_node, &pinctrl_maps, node) {
 		if (maps_node->maps == map) {
 			list_del(&maps_node->node);
+			kfree(maps_node);
 			mutex_unlock(&pinctrl_maps_mutex);
 			return;
 		}