eventcomm: add a missing break statement

If the EV_SYN wasn't SYN_REPORT, we'd fall through to key event processing,
which almost certainly won't do what we want and/or need.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Cyril Brulebois <kibi@debian.org>
(cherry picked from commit ecf42db476)

src/eventcomm.c

@@ -341,6 +341,7 @@ EventReadHwState(InputInfoPtr pInfo,
 		*hwRet = *hw;
 		return TRUE;
 	    }
+	    break;
 	case EV_KEY:
 	    v = (ev.value ? TRUE : FALSE);
 	    switch (ev.code) {