USB: DWC3: gadget: Fix compilation error in gadget.c

Initialize local variable to zero to fix the compilation error
of uninitialized variable.

Change-Id: Ia23a0239228fb0c2c8d7dff5daee0701c178f82a
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index dc35da8..9b1576b 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1490,7 +1490,7 @@
 {
 	struct dwc3 *dwc = gadget_to_dwc(_gadget);
 	unsigned long flags;
-	int ret;
+	int ret = 0;
 
 	if (!dwc->dotg)
 		return -EPERM;