unix: Do not dump unused external sockets

Do not dump external sockets, that are not peers
for some processes sockets. We do not use them on
restore ==> we do not need to dump them.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>

 criu/sk-unix.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/sk-unix.c

@@ -743,7 +743,8 @@ int fix_external_unix_sockets(void)
 		FownEntry fown = FOWN_ENTRY__INIT;
 		SkOptsEntry skopts = SK_OPTS_ENTRY__INIT;
 
-		if (sk->sd.already_dumped)
+		if (sk->sd.already_dumped ||
+		    list_empty(&sk->peer_list))
 			continue;
 
 		show_one_unix("Dumping extern", sk);