usb: phy: Fix double lock in OTG FSM

Mutex obtained at the beginning of the function should
be released at the end to avoid double locking.
Signed-off-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/phy-fsm-usb.c

@@ -357,7 +357,7 @@ int otg_statemachine(struct otg_fsm *fsm)
 	default:
 		break;
 	}
-	mutex_lock(&fsm->lock);
+	mutex_unlock(&fsm->lock);
 
 	VDBG("quit statemachine, changed = %d\n", state_changed);
 	return state_changed;