- mark usage() as __dead

- combine function call and return value checking into one statement
- use errx() instead of fprintf(stderr)/exit()
- style(9)ed returns
- better comments
- proper initializing of agt var
- add usage to device_dump()
- grammar
- some -W -Wall fixes
- add missing exit()s in usage blocks
- simplify sec_getpass() function

Work by Andrey Matveev <andrushock@korovino.net> and me.
ok gluk@

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