kern/140036: [iwn] [lor] lock order reversal with iwn0_com_lock and iwn0 softc lock

[Benjamin Kaduk]

To follow-up after a fairly long hiatus: I had been running Bernhard's
driver from his svn repository for a while with no LORs. Over the weekend,
I updated past FreeBSD r201882 to pick up Rui's big update from
r201209 as well as the firmware error fix in r201882.
I do not see the LOR anymore (and I had a rather repeatable
test case), so I think that this PR should be closed.

I didn't have a reliable way to reproduce the firmware
error, though, so no data if that is fixed for me, too.

-Ben Kaduk