USB: gadget: at91_adc: fix pullup pin validity check

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/at91_udc.c

@@ -1738,7 +1738,7 @@ static int at91udc_probe(struct platform_device *pdev)
 
 	/* rm9200 needs manual D+ pullup; off by default */
 	if (cpu_is_at91rm9200()) {
-		if (gpio_is_valid(udc->board.pullup_pin)) {
+		if (!gpio_is_valid(udc->board.pullup_pin)) {
 			DBG("no D+ pullup?\n");
 			retval = -ENODEV;
 			goto fail0;