drm/fb-helper: Return early in damage worker

Returning early in the damage worker if no update is required. Makes the
code more readable. No functional changes are being made.

v3:
	* s/dirty/damage in commit message (Sam)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201120102545.4047-6-tzimmermann@suse.de

drivers/gpu/drm/drm_fb_helper.c

@@ -407,8 +407,9 @@ static void drm_fb_helper_damage_work(struct work_struct *work)
 	clip->x2 = clip->y2 = 0;
 	spin_unlock_irqrestore(&helper->damage_lock, flags);
 
-	/* call dirty callback only when it has been really touched */
-	if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) {
+	/* Call damage handlers only if necessary */
+	if (!(clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2))
+		return;
 
 	/* Generic fbdev uses a shadow buffer */
 	if (helper->buffer) {
@@ -419,12 +420,10 @@ static void drm_fb_helper_damage_work(struct work_struct *work)
 	}
 
 	if (helper->fb->funcs->dirty)
-			helper->fb->funcs->dirty(helper->fb, NULL, 0, 0,
-						 &clip_copy, 1);
+		helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
 
 	if (helper->buffer)
 		drm_client_buffer_vunmap(helper->buffer);
-	}
 }
 
 /**