USB: allow both root-hub interrupts and polling

Originally I didn't think any host controller driver would ever use
interrupts and polling at the same time, but it turns out ohci-hcd wants
to do exactly that.  This patch (as788) makes it possible.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/hcd.c

@@ -836,8 +836,7 @@ void usb_enable_root_hub_irq (struct usb_bus *bus)
 	struct usb_hcd *hcd;
 
 	hcd = container_of (bus, struct usb_hcd, self);
-	if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
-			hcd->state != HC_STATE_HALT)
+	if (hcd->driver->hub_irq_enable && hcd->state != HC_STATE_HALT)
 		hcd->driver->hub_irq_enable (hcd);
 }