drm/drm_gem.c: Remove surplus else after return

else is not generally useful after return
Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230622101857.2298773-1-suijingfeng@loongson.cn

drivers/gpu/drm/drm_gem.c

@@ -1150,8 +1150,8 @@ int drm_gem_pin(struct drm_gem_object *obj)
 {
 	if (obj->funcs->pin)
 		return obj->funcs->pin(obj);
-	else
-		return 0;
+
+	return 0;
 }
 
 void drm_gem_unpin(struct drm_gem_object *obj)