MUSB: Kill compile warnings at drivers/usb/musb/tusb6010.c

Get rid of the following warning:
drivers/usb/musb/tusb6010.c: In function 'tusb_otg_ints':
drivers/usb/musb/tusb6010.c:716: warning: unused variable 'devctl'
Signed-off-by: Felipe Balbi <felipe.lima@indt.org.br>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/usb/musb/tusb6010.c

@@ -713,8 +713,6 @@ tusb_otg_ints(struct musb *musb, u32 int_src, void __iomem *base)
 			schedule_work(&musb->irq_work);
 
 		} else /* A-dev state machine */ {
-			u8	devctl;
-
 			DBG(2, "vbus change, %s, otg %03x\n",
 				otg_state_string(musb), otg_stat);