drm/fb-helper: Remove unnecessary list empty check in drm_fb_helper_debug_enter()

The following list empty check is unnecessary because we would still do nothing
real and return 'val' if my_list is empty.

if (list_empty(&my_list))
	return val;

list_for_each_entry(pos, &my_list, member) {
	...
}

return val;

This patch removes the unnecessary check in drm_fb_helper_debug_enter().

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_fb_helper.c

@@ -199,9 +199,6 @@ int drm_fb_helper_debug_enter(struct fb_info *info)
 	struct drm_crtc_helper_funcs *funcs;
 	int i;
 
-	if (list_empty(&kernel_fb_helper_list))
-		return false;
-
 	list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
 		for (i = 0; i < helper->crtc_count; i++) {
 			struct drm_mode_set *mode_set =