This fix a problem introduced in commit 65466652. It closes also:
https://bugs.freedesktop.org/show_bug.cgi?id=30160
Reported-by: <xunx.fang@intel.com>
Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Signed-off-by: Keith Packard <keithp@keithp.com>