lib.sh: simplify err()

Rely once again on err_, but still explicitly add an exit
just below, in case I made a mistake one day.

err() is essentially a trap that triggers in case I mess
up an error function, so that it doesn't reliably exit.

So, the idea is that everything calls err(), and err() is
almost never modified, or modified very carefully.

If error exits were ever broken, the result could be quite
unpredictable, so lbmk has very strict error handling, and
great care is taken to ensure that it does reliably exit.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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