Re-up the TX ath_buf limit from 128 to 512.
Re-up the TX ath_buf limit from 128 to 512.

I'll have to leave this high for now, until I've done some significant
surgery with how ath_bufs (and descriptors) are handled.

This should significantly cut down on the opportunities for a full TX
queue hanging traffic.  I'll continue making things work though; I'm
mostly doing this for users. :)

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