xen/pcifront: avoid pci_frontend_enable_msix() falsely returning success
The original XenoLinux code has always had things this way, and for compatibility reasons (in particular with a subsequent pciback adjustment) upstream Linux should behave the same way (allowing for two distinct error indications to be returned by the backend). Signed-off-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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