ARM/USB: at91/ohci-at91: remove the use of irq_to_gpio

irq_to_gpio() macro will be removed from AT91 GPIO interrupt
controller. So we replace it with the use of gpio_to_irq()
and a reworked test.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: linux-usb@vger.kernel.org

drivers/usb/host/ohci-at91.c

@@ -448,11 +448,12 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data)
 
 	/* From the GPIO notifying the over-current situation, find
 	 * out the corresponding port */
-	gpio = irq_to_gpio(irq);
 	for (port = 0; port < ARRAY_SIZE(pdata->overcurrent_pin); port++) {
-		if (pdata->overcurrent_pin[port] == gpio)
+		if (gpio_to_irq(pdata->overcurrent_pin[port]) == irq) {
+			gpio = pdata->overcurrent_pin[port];
 			break;
 		}
+	}
 
 	if (port == ARRAY_SIZE(pdata->overcurrent_pin)) {
 		dev_err(& pdev->dev, "overcurrent interrupt from unknown GPIO\n");