drm/mst: delete unnecessary case in drm_dp_add_payload_part2()

[Why]
There is no need to consider payload->delete case since we won't call
drm_dp_add_payload_part2() to create a payload when we're about to
remove it.

[How]
Delete unnecessary case to simplify the code.
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230807025639.1612361-2-Wayne.Lin@amd.com

drivers/gpu/drm/display/drm_dp_mst_topology.c

@@ -3411,12 +3411,8 @@ int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
 
 	ret = drm_dp_create_payload_step2(mgr, payload);
 	if (ret < 0) {
-		if (!payload->delete)
-			drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n",
-				payload->port, ret);
-		else
-			drm_dbg_kms(mgr->dev, "Step 2 of removing MST payload for %p failed: %d\n",
-				    payload->port, ret);
+		drm_err(mgr->dev, "Step 2 of creating MST payload for %p failed: %d\n",
+			payload->port, ret);
 	}
 
 	return ret;