* Call restore_ns on error paths.
* Use close_safe for the socket, because it can be reused

CID 996194 (#1 of 3): Resource leak (RESOURCE_LEAK)
6. leaked_handle: Handle variable "rst" going out of scope leaks the
handle.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>