[RFC] Allow empty Trigger Error Action Table

[Niklas SÃderlund]

When troubleshooting some BIOS code I encounter strange errors about firmware bugs. On closer inspection I found that the Trigger table returned from the firmware was empty but the header looked OK:

header_size = 16
table_size = 16
entry_count = 0

When looking at einj.c I found that this header would result in the error I was receiving. I took a quick look at the docs and from what I can tell this is a valid header, yes?

I don't know much about ACPI so I might be way off but the attached patch fix the error message for me (however I still can't detect the injected error but that might depend on my detection code or buggy firmware...)

Thanks
// Niklas

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