rxrpc: Fix server keyring leak
If someone calls setsockopt() twice to set a server key keyring, the first keyring is leaked. Fix it to return an error instead if the server key keyring is already set. Fixes: 17926a79 ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both") Signed-off-by: David Howells <dhowells@redhat.com>
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