nbd: Refactor conversion to errno to silence checkpatch
Checkpatch complains that 'return EINVAL' is usually wrong (since we tend to favor 'return -EINVAL'). But it is a false positive for nbd_errno_to_system_errno(). Since NBD may add future defined wire values, refactor the code to keep checkpatch happy. Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <1476469998-28592-14-git-send-email-eblake@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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