Adrian Chadd ade5fbb745 Correctly initialise the 2-chain antenna mask in the link quality table.
The previous code simply hard-coded IWN_ANT_AB which is only correct for
some of the NICs.

Now, if the NIC is a 1-stream TX, you need to set IWN_ANT_AB and _not_
just a single antenna.  The Intel 5100 firmware panics the moment the
link quality table is updated.

So!

* no secondary antenna? Set it to IWN_ANT_AB;
* two-stream device? Transmit on the full transmit antenna configuration.

Tested:

* Intel 5100, STA
* Intel 2200 (eadler)

Obtained from:	Linux iwlwifi
2013-11-13 07:09:00 +00:00
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