Enable printf format attributes to logit() and flog()
Enable printf format attributes to logit() and flog()

We don't want repeats of issue #236, so let's start by tracking down any
bugs hidden in logging functions.

Signed-off-by: Joachim Wiberg <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit