drm/modes: drop return value from drm_display_mode_from_videomode

It never fails and no one ever checked anyway.

Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/drm_modes.c

···
 EXPORT_SYMBOL(drm_gtf_mode);
 
 #ifdef CONFIG_VIDEOMODE_HELPERS
-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)
 {
 	dmode->hdisplay = vm->hactive;
 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
···
 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
 	drm_mode_set_name(dmode);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
 

include/drm/drm_modes.h

···
 					      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);