Return connection_exit_connect() if payload creation failed.

Fixes bug #7592; bugfix on 882b389668067a29bb539d0f5bd5cb2f83b93012.

The bug is not present in any released versions of Tor.

src/or/connection_edge.c

@@ -2614,6 +2614,7 @@ connection_exit_connect(edge_connection_t *edge_conn)
       connection_edge_end(edge_conn, END_STREAM_REASON_INTERNAL);
       circuit_detach_stream(circuit_get_by_edge_conn(edge_conn), edge_conn);
       connection_free(conn);
+      return;
     }
 
     connection_edge_send_command(edge_conn,