net80211: Fix ifdetach w/o ifattach, small whitespace cleanup

net80211: Fix ifdetach w/o ifattach, small whitespace cleanup

As the comment says, ifdetach might be called during the course of driver
detach if initialization failed. This shouldn't be a total failure, though,
we just have nothing to do there.

This has been modified slightly from Augustin's original commit to move the
bail-out slightly earlier since the ic wouldn't have been added to the
ic list in the first place, and a comment has been added describing when
this might be an issue.

Submitted by:	Augustin Cavalier <waddlesplash@gmail.com>
Obtained from:	Haiku (e6f6c1b4633532a8ad37c803dc7c65601e5b24ba)