cosmetic: return NULL instead of 0
cosmetic: return NULL instead of 0

we're returning a pointer

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>
Reviewed-by: Bryce Harrington <bdb14cfc1ab8d24e13de84adc40b41ae60c13bd1@osg.samsung.com>

mchalupa/wayland,sir-murray/wayland,sir-murray/wayland,mchalupa/wayland,mchalupa/wayland,sir-murray/wayland