USB: musb free_irq bugfix

Fixes insert module failure as free_irq() was not
done in previous rmmod.
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/musb_core.c

@@ -1824,8 +1824,9 @@ static void musb_free(struct musb *musb)
 	musb_gadget_cleanup(musb);
 #endif
 
-	if (musb->nIrq >= 0 && musb->irq_wake) {
-		disable_irq_wake(musb->nIrq);
+	if (musb->nIrq >= 0) {
+		if (musb->irq_wake)
+			disable_irq_wake(musb->nIrq);
 		free_irq(musb->nIrq, musb);
 	}
 	if (is_dma_capable() && musb->dma_controller) {