Formerly we sized an array with a compile time constant, then initialized
its size to the same constant, but the Linux PCI init code would increase
that "constant".  So if you happened to have more than 128 PCI devices,
you'd happily scribble into whatever variables happened to be in .bss
after that array.

Only really fixed for Linux atm.  Other OSes will simply (still) fail to
work on video devices above the 128th PCI device.