Flush input after re-opening the fd.

Suggested by Julien Cristau.

Signed-off-by: Peter Hutterer <peter.hutterer@redhat.com>
(cherry picked from commit a43ab4999b)

src/evdev.c

@@ -1007,6 +1007,7 @@ EvdevOn(DeviceIntPtr device)
         pEvdev->reopen_timer = TimerSet(NULL, 0, 100, EvdevReopenTimer, pInfo);
     } else
     {
+        xf86FlushInput(pInfo->fd);
         xf86AddEnabledDevice(pInfo);
         EvdevMBEmuOn(pInfo);
         pEvdev->flags |= EVDEV_INITIALIZED;