drm/modes: drop return value from drm_display_mode_from_videomode

It never fails and no one ever checked anyway.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 2769b05..b23628b 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -188,8 +188,8 @@
 					      int margins,
 					      int GTF_M, int GTF_2C,
 					      int GTF_K, int GTF_2J);
-int drm_display_mode_from_videomode(const struct videomode *vm,
-				    struct drm_display_mode *dmode);
+void drm_display_mode_from_videomode(const struct videomode *vm,
+				     struct drm_display_mode *dmode);
 int of_get_drm_display_mode(struct device_node *np,
 			    struct drm_display_mode *dmode,
 			    int index);