Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/tbdffmt/readme

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add varargchk to io.h to allow use outside pci.c
extend %T to be used with tbdf == BUSUNKNOWN
without this change BUSUNKNOWN -> type < 0
which results in a negative index with bustypes[].
for example, an ide device could be BUSUNKNOWN
or a valid pci or isa device.

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