clipboard: zalloc the clipboard_source

The wrapped weston_data_source struct has new fields which were left
uninitialized, so its access is unreliable.

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com
Tested-by: Derek Foreman <derekf@osg.samsung.com>
1 file changed