Fix USB mouse Set_Protocol behavior

The QEMU USB mouse claims to support the "boot" protocol
(bInterfaceSubClass is 1).  However, the mouse rejects the
Set_Protocol command.

The qemu mouse does support the "boot" protocol specification, so a
simple fix is to enable the Set_Protocol request.
Signed-off-by: NKevin O'Connor <kevin@koconnor.net>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb-hid.c

@@ -782,13 +782,13 @@ static int usb_hid_handle_control(USBDevice *dev, USBPacket *p,
             goto fail;
         break;
     case GET_PROTOCOL:
-        if (s->kind != USB_KEYBOARD)
+        if (s->kind != USB_KEYBOARD && s->kind != USB_MOUSE)
             goto fail;
         ret = 1;
         data[0] = s->protocol;
         break;
     case SET_PROTOCOL:
-        if (s->kind != USB_KEYBOARD)
+        if (s->kind != USB_KEYBOARD && s->kind != USB_MOUSE)
             goto fail;
         ret = 0;
         s->protocol = value;