mesh: Fix memory leak on error path

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
diff --git a/wpa_supplicant/mesh_rsn.c b/wpa_supplicant/mesh_rsn.c
index 9dce32f..747f1ae 100644
--- a/wpa_supplicant/mesh_rsn.c
+++ b/wpa_supplicant/mesh_rsn.c
@@ -210,6 +210,7 @@
 
 	if (__mesh_rsn_auth_init(mesh_rsn, wpa_s->own_addr) < 0) {
 		mesh_rsn_deinit(mesh_rsn);
+		os_free(mesh_rsn);
 		return NULL;
 	}