usb: message: remove redundant declaration

Fix the Sparse warning:

message.c:1390:21: warning: symbol 'i' shadows an earlier one
message.c:1294:13: originally declared here
Signed-off-by: NKris Borer <kborer@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/message.c

@@ -1387,8 +1387,6 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate)
 	 * new altsetting.
 	 */
 	if (manual) {
-		int i;
-
 		for (i = 0; i < alt->desc.bNumEndpoints; i++) {
 			epaddr = alt->endpoint[i].desc.bEndpointAddress;
 			pipe = __create_pipe(dev,