The patch fixes this compiler's warning: lib/gui/image_renderer.c:92:6: warning: no previous prototype for 'image_renderer_unregister' [-Wmissing-prototypes] void image_renderer_unregister(struct image_renderer *ir) ^ Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>