imx: ventana: Avoid undefined behaviour

The leds array within struct ventana has space for 3 elements, but the
setup_board_gpio() function tries to set up 4 GPIOs for LEDs. Recent
versions of GCC complain about that:

	board/gateworks/gw_ventana/gw_ventana.c: In function 'setup_board_gpio':
	board/gateworks/gw_ventana/gw_ventana.c:987:27: warning: iteration 3u invokes undefined behavior [-Waggressive-loop-optimizations]
	   if (gpio_cfg[board].leds[i])
				   ^
	board/gateworks/gw_ventana/gw_ventana.c:986:2: note: containing loop
	  for (i = 0; i < 4; i++) {
	  ^

Fix this by making the upper bound of the loop match the array size.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Tim Harvey <tharvey@gateworks.com>

board/gateworks/gw_ventana/gw_ventana.c

@@ -1061,7 +1061,7 @@ static void setup_board_gpio(int board)
 #endif
 
 	/* turn off (active-high) user LED's */
-	for (i = 0; i < 4; i++) {
+	for (i = 0; i < ARRAY_SIZE(gpio_cfg[board].leds); i++) {
 		if (gpio_cfg[board].leds[i])
 			gpio_direction_output(gpio_cfg[board].leds[i], 1);
 	}