usb: dwc3: no need to initialize ret variable

First usage of ret variable will re-write initial value. Thus, there is no need
to initialize it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

@@ -584,7 +584,7 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 {
 	struct dwc3		*dwc = dep->dwc;
 	u32			reg;
-	int			ret = -ENOMEM;
+	int			ret;
 
 	dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);