eventcomm: read one more event after finishing a sync

Once the sync finishes, we get -EAGAIN. This only indicates the sync is done,
but some events may still be waiting in the pipe for us to read. We must read
those now, otherwise select may not trigger on further data.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

src/eventcomm.c

@@ -491,8 +491,10 @@ SynapticsReadEvent(InputInfoPtr pInfo, struct input_event *ev)
         if (rc != -EAGAIN) {
             LogMessageVerbSigSafe(X_ERROR, 0, "%s: Read error %d\n", pInfo->name,
                     errno);
-        } else if (proto_data->read_flag == LIBEVDEV_READ_FLAG_SYNC)
+        } else if (proto_data->read_flag == LIBEVDEV_READ_FLAG_SYNC) {
             proto_data->read_flag = LIBEVDEV_READ_FLAG_NORMAL;
+            return SynapticsReadEvent(pInfo, ev);
+        }
 
         return FALSE;
     }