mesh: fix memory leak and group send

fix a bug in group send
fix esp_mesh_set_router when router_t not initialized
fix mesh memory leak with invalid option

diff --git a/components/esp32/lib b/components/esp32/lib
index c30a45ea61d9371806ad38366d75950da9664e48..b272ad1e333689eb6985efe4e26774bb953ecce1 160000 (submodule)
--- a/components/esp32/lib
+++ b/components/esp32/lib
@@ -1 +1 @@
-Subproject commit c30a45ea61d9371806ad38366d75950da9664e48
+Subproject commit b272ad1e333689eb6985efe4e26774bb953ecce1