526e5c6559
Rather than open-coding NBD_REP_SERVER, reuse the code we already have by adding a length parameter. Additionally, the refactoring will make adding NBD_OPT_GO in a later patch easier. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1476469998-28592-7-git-send-email-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>