socket: skipe unsupported sockets (v2)

We collect all unix sockets in the current net namespace, but
a target process uses a few of them, so we may skip unsupported sockets
and if it is used by a target process, lookup_socket returns error.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

sockets.c

@@ -239,8 +239,8 @@ static int unix_collect_one(struct unix_diag_msg *m, struct rtattr **tb)
 			struct stat st;
 
 			if (name[0] != '/') {
-				pr_err("Relative bind path unsupported\n");
-				goto err;
+				pr_warning("Relative bind path unsupported\n");
+				return 0;
 			}
 
 			if (!tb[UNIX_DIAG_VFS]) {