usb: gadget: fsl_udc_core: should not call gadget driver's .unbind

It has already been covered by udc core

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/fsl_udc_core.c b/drivers/usb/gadget/fsl_udc_core.c
index ccbb302..57944ee 100644
--- a/drivers/usb/gadget/fsl_udc_core.c
+++ b/drivers/usb/gadget/fsl_udc_core.c
@@ -1957,7 +1957,6 @@
 						    &udc_controller->gadget);
 			if (retval < 0) {
 				ERR("can't bind to transceiver\n");
-				driver->unbind(&udc_controller->gadget);
 				udc_controller->driver = 0;
 				return retval;
 			}