render: don't bother with animated cursors on floating slaves (#39989)

X.Org Bug 39989 <http://bugs.freedesktop.org/show_bug.cgi?id=39989>

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>

render/animcur.c

@@ -208,6 +208,9 @@ AnimCurDisplayCursor (DeviceIntPtr pDev,
     AnimCurScreenPtr    as = GetAnimCurScreen(pScreen);
     Bool		ret;
 
+    if (IsFloating(pDev))
+	    return FALSE;
+
     Unwrap (as, pScreen, DisplayCursor);
     if (IsAnimCur(pCursor))
     {