Fix one genuine bug and a potential one:
Fix one genuine bug and a potential one:

  -#if defined(__FreeBSD__) && __FreeBSD_version__ >= 500023
  +#if defined(__FreeBSD__) && __FreeBSD_version >= 500023

is a genuine bug -- __FreeBSD_version__ does not exist.
The other one:

  -#if (__FreeBSD__ < 5)
  +#if (__FreeBSD_version < 500000)

pops out when you cross-compile the code:

  __FreeBSD__			is a compiler predefine,
  __FreeBSD_version		is defined in <sys/param.h> .

Given that in this case (and all others in sys/dev/usb and sys/i4b)
the goal is to adapt to a different kernel interface, and not to
a compiler feature, I believe the correct form is the second one
(in the best case the two are synonyms so the change does not break
anything anyways).

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