ath: use the new net80211 methods for AMPDU density/limit, short-GI

[adrian]

Summary

Now that net80211 has this code, just leverage it instead of rolling
our own.

[adrian]

add url

[adrian]

vap is used in the debug statement, so (void) it so it is "used" during
non-debug builds.

[emaste]

sys/dev/ath/if_ath_tx_ht.c

568

Or add __diagused to the variable declaration

[bz]

sys/dev/ath/if_ath_tx_ht.c

568

@emaste Will that work with the assignment on it?
Alternatively add the needed #ifdef or simply replace vap in the DPRINTF with ni->ni_vap and not have any of these problems.

[emaste]

sys/dev/ath/if_ath_tx_ht.c

568

We do have some cases like that, e.g.

sys/net/route/route_ctl.c:      struct nhop_object __diagused *nh_src = rnd_src->rnd_nhop;
sys/opencrypto/criov.c: int iol __diagused = uio->uio_iovcnt;
sys/opencrypto/criov.c: int iol __diagused = uio->uio_iovcnt;
sys/opencrypto/criov.c: int iol __diagused = uio->uio_iovcnt;
sys/vm/vm_glue.c:       size_t kpages __diagused = kstack_pages + KSTACK_GUARD_PAGES;
sys/vm/vm_object.c:     vm_object_t object __diagused = objectv;

but indeed just using ni->ni_vap->iv_ampdu_limit would be easiest

[adrian]

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