os-posix: remove confused errno
If we get inside the 'else if (status == 1)' conditional, then we know that read() succeeded, and therefore errno is unspecified. Printing strerror(errno) on a random value is not helpful. Cc: Eric Blake <eblake@redhat.com> Signed-off-by: NGonglei <arei.gonglei@huawei.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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