Bug#734976: fail to flush all tx fifo queues Q 2

[Gerasimos Melissaratos <gmelis@mikroskosmos.gr>]

There seems to be a fix in
https://git.kernel.org/cgit/linux/kernel/git/iwlwifi/iwlwifi-fixes.git/commit/?id=ff36e3756cc8abb42608ceed4d173d128ac4c9ad

and a pretty extensive discussion in
https://bugzilla.kernel.org/show_bug.cgi?id=56581

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<signature>
  <name>   Gerasimos Melissaratos      </name>
  <title>  Systems Administrator       </title>
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