nbd: Close socket on negotiation failure.
Otherwise, the nbd client may hang waiting for the server response. Signed-off-by: NHani Benhabiles <hani@linux.com> Acked-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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