kstat queues should assert on both platforms
At present, we assert that q_len is not 0 on SPARC only, because SPARC seems to have asm implementations of kstat_q_* for some reason.
If the assert is a valid thing to do (and I say "assert", it appears to actually be not conditional on DEBUG), it should be done on both platforms. If invalid, on neither. It definitely should not be platform specific while in a common interface