SUNRPC: Don't leak sockets in xs_local_connect()

If there is still a closed socket associated with the transport, then we
need to trigger an autoclose before we can set up a new connection.

Reported-by: wanghai (M) <wanghai38@huawei.com>
Fixes: f0043206 ("SUNRPC: Ensure we flush any closed sockets before xs_xprt_free()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>