usb: core: hcd: make hcd->irq unsigned

There's really no point in having hcd->irq as a
signed integer when we consider the fact that
IRQ 0 means NO_IRQ. In order to avoid confusion,
make hcd->irq unsigned and fix users who were
passing -1 as the IRQ number to usb_add_hcd.

Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/musb_core.c

@@ -1987,7 +1987,7 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
 		musb->xceiv->otg->default_a = 1;
 		musb->xceiv->state = OTG_STATE_A_IDLE;
 
-		status = usb_add_hcd(musb_to_hcd(musb), -1, 0);
+		status = usb_add_hcd(musb_to_hcd(musb), 0, 0);
 
 		hcd->self.uses_pio_for_control = 1;
 		dev_dbg(musb->controller, "%s mode, status %d, devctl %02x %c\n",

drivers/usb/musb/musb_gadget.c

@@ -1957,7 +1957,7 @@ static int musb_gadget_start(struct usb_gadget *g,
 		 * handles power budgeting ... this way also
 		 * ensures HdrcStart is indirectly called.
 		 */
-		retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
+		retval = usb_add_hcd(musb_to_hcd(musb), 0, 0);
 		if (retval < 0) {
 			dev_dbg(musb->controller, "add_hcd failed, %d\n", retval);
 			goto err2;