kernel/bwn: Remove an unnecessary call to ieee80211_start_all

* Fixes a bug when the firmware is not found.
cryptsetup: Fix a compilation warning

Submitted-by: Matthew Dillon <dillon@apollo.backplane.com>
Remove the RELEASE_CRUNCH build variable

* It was used to specially craft binaries for use with PicoBSD in the
  distant past.

* The conditional code paths it enables have not been maintained for
  more than a decade and are of dubious value.

* At this point it's best to just remove it.