MT#55283 fix session reference booboo

If we remove a session that is not the session we're looking for
(re-used session ID after a removal race), we must return the incorrect
session to the hash table.

Change-Id: Iab73e1994251e5be766406b4e537a954b0e81f07
(cherry picked from commit 164f688)

daemon/janus.c

@@ -1465,8 +1465,11 @@ static const char *janus_destroy(struct websocket_message *wm, JsonReader *reade
 
 	struct janus_session *ht_session = NULL;
 	t_hash_table_steal_extended(janus_sessions, &session->id, NULL, &ht_session);
-	if (ht_session != session)
+	if (ht_session != session) {
+		if (ht_session) // return wrongly stolen session
+			t_hash_table_insert(janus_sessions, &ht_session->id, ht_session);
 		return "Sesssion ID not found"; // already removed/destroyed
+	}
 
 	janus_session_cleanup(session);
 	obj_put(session);