Use read() instead of fread() to read from "/proc/bus/pci/%02x/%02x.%d".

Thanks a lot to Tom Cox for finding this bug:

	  The proc.c module in the kernel source clearly states that
	  reading more than 64 bytes can cause problems. The pci.c
	  module in the ldetect library uses the buffered fread()
	  function. This function always reads in blocks, so when
	  run as root, the read always tried to read more than the
	  user requested amount.

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