Adrian Chadd 6edf1dc729 Change the descriptor logic to use bf_lastds to point to the last
descriptor, rather than using the maths involving bf_desc[bf_nseg - 1].

When doing TX aggregation, the status will be updated in the -final-
descriptor of the -final- subframe in an aggregate. Thus bf_lastds
may point to the last descriptor in a completely different ath_buf.

Sponsored by:	Hobnob, Inc.
2011-11-08 21:25:36 +00:00
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