Controller: fixed cleaning up of control socket file in some cases.
Controller: fixed cleaning up of control socket file in some cases.

Previously, the unix domain control socket file might have been left
in the file system after a failed nxt_listen_socket_create() call.

nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit