K 10
svn:author
V 6
adrian
K 8
svn:date
V 27
2011-11-08T21:13:05.638989Z
K 7
svn:log
V 336
Change ath_buf allocation to:

* Immediately return NULL if a buffer isn't available;
* Track the "buffers not available" count;
* Clear some fields used for tx aggregation;
* Add ath_buf_clone() which clones the majority of buffer state.
  This is needed when retransmission of a "busy" buffer is required.

Sponsored by:	Hobnob, Inc.

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