gpio: ep93xx: fix test for end of loop

The problem is that if port == ARRAY_SIZE() and "gc == &epg->gc[port]"
then that should be treated as invalid.

Fixes: fd935fc4 ("gpio: ep93xx: Do not pingpong irq numbers")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-ep93xx.c

@@ -80,7 +80,7 @@ static int ep93xx_gpio_port(struct gpio_chip *gc)
 		port++;
 
 	/* This should not happen but is there as a last safeguard */
-	if (gc != &epg->gc[port]) {
+	if (port == ARRAY_SIZE(epg->gc)) {
 		pr_crit("can't find the GPIO port\n");
 		return 0;
 	}