Fix two comments that got lost in the disentanglement of the larger diff.
Fix the order of TX shutdown and reset.

* Grab the reset lock first, so any subsequent interrupt, TX, RX work
  will fail

* Then shut down interrupts

* Then wait for TX/RX to finish running

At this point no further work will be running, so it's safe to do the
reset path code.

PR:		kern/179232
ld80 and ld128 implementations of expm1l().  This code started life
as a fairly faithful implementation of the algorithm found in

PTP Tang, "Table-driven implementation of the Expm1 function
in IEEE floating-point arithmetic," ACM Trans. Math. Soft., 18,
211-222 (1992).

Over the last 18-24 months, the code has under gone significant
optimization and testing.

Reviewed by:	bde
Obtained from:	bde (most of the optimizations)
ext2fs: Small cosmetic fixes.

Make a long macro readable and sort a header.

Obtained from:	Christoph Mallon
MFC after:	3 days
Change a comma to a semicolon.

Remove a blank line that crept into the declarations.

Fix a comment to show a sign on a NaN.