libertas: pepper main with debug statement

libertas: re-pepper debug statementThe recent fluff of updates
didn't put proper lbs_deb_enter/leave calls into the source code.
Add them where appropriate.

Also contains some whitespace changes.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>