PCI/MSI: Return -ENOSYS for unimplemented interfaces, not -1
Suggested-by: NBen Hutchings <bhutchings@solarflare.com> Signed-off-by: NAlexander Gordeev <agordeev@redhat.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NTejun Heo <tj@kernel.org>
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