drm/amd/display: remove no need variable

remove no need variable, just return the DC_OK
Signed-off-by: Bernard Zhao <bernard@vivo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c

@@ -1266,8 +1266,6 @@ static enum dc_status dcn10_validate_global(struct dc *dc, struct dc_state *cont
 
 static enum dc_status dcn10_patch_unknown_plane_state(struct dc_plane_state *plane_state)
 {
-	enum dc_status result = DC_OK;
-
 	enum surface_pixel_format surf_pix_format = plane_state->format;
 	unsigned int bpp = resource_pixel_format_to_bpp(surf_pix_format);
 
@@ -1279,7 +1277,7 @@ static enum dc_status dcn10_patch_unknown_plane_state(struct dc_plane_state *pla
 		swizzle = DC_SW_64KB_S;
 
 	plane_state->tiling_info.gfx9.swizzle = swizzle;
-	return result;
+	return DC_OK;
 }
 
 struct stream_encoder *dcn10_find_first_free_match_stream_enc_for_link(