wxx: Fix compiler warning for host-libusb.c

The local variable i is unsed for Windows.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Message-id: 1469775569-7869-1-git-send-email-sw@weilnetz.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/host-libusb.c

@@ -235,7 +235,7 @@ static int usb_host_init(void)
 #ifndef CONFIG_WIN32
     const struct libusb_pollfd **poll;
 #endif
-    int i, rc;
+    int rc;
 
     if (ctx) {
         return 0;
@@ -253,6 +253,7 @@ static int usb_host_init(void)
                                 ctx);
     poll = libusb_get_pollfds(ctx);
     if (poll) {
+        int i;
         for (i = 0; poll[i] != NULL; i++) {
             usb_host_add_fd(poll[i]->fd, poll[i]->events, ctx);
         }