af_unix: call proto_unregister() in the error path in af_unix_init()

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2164865
Upstream Status: net.git commit 73e341e

commit 73e341e
Author: Yang Yingliang <yangyingliang@huawei.com>
Date:   Thu Dec 8 23:01:58 2022 +0800

    af_unix: call proto_unregister() in the error path in af_unix_init()

    If register unix_stream_proto returns error, unix_dgram_proto needs
    be unregistered.

    Fixes: 94531cf ("af_unix: Add unix_stream_proto for sockmap")
    Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
    Reviewed-by: Simon Horman <simon.horman@corigine.com>
    Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Davide Caratti <dcaratti@redhat.com>

Author: dcaratti

net/unix/af_unix.c

@@ -3512,6 +3512,7 @@ static int __init af_unix_init(void)
 	rc = proto_register(&unix_stream_proto, 1);
 	if (rc != 0) {
 		pr_crit("%s: Cannot create unix_sock SLAB cache!\n", __func__);
+		proto_unregister(&unix_dgram_proto);
 		goto out;
 	}