pinctrl: single: fix pinctrl_spec.args_count bounds check

The property #pinctrl-cells can either be 1 or 2:

- if #pinctrl-cells = <1>, then pinctrl_spec.args_count = 2
- if #pinctrl-cells = <2>, then pinctrl_spec.args_count = 3

All other values of pinctrl_spec.args_count are incorrect.  This fix
checks the upper bound instead of just the lower bound.

Fixes: a133954 ("pinctrl: single: parse #pinctrl-cells = 2")
Reported-by: Trent Piepho <[email protected]>
Signed-off-by: Drew Fustini <[email protected]>
Acked-by: Tony Lindgren <[email protected]>
Link: https://lore.kernel.org/linux-omap/[email protected]/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: pdp7

drivers/pinctrl/pinctrl-single.c

@@ -1014,7 +1014,7 @@ static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
 		if (res)
 			return res;
 
-		if (pinctrl_spec.args_count < 2) {
+		if (pinctrl_spec.args_count < 2 || pinctrl_spec.args_count > 3) {
 			dev_err(pcs->dev, "invalid args_count for spec: %i\n",
 				pinctrl_spec.args_count);
 			break;