MFC r305812:

fifolog(1): invert order of calloc(3) arguments.

The second argument to calloc(3) should be the size, make it so.

While here be a little bit more cautious in fifolog_reader_open()
to protect in the unlikely event of an overflowed allocation.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix a bunch of trivial whitespace mistakes and update the miniobj.h
file before the real work starts.

Remove trailing ';' on macros.

Spotted by: antoine

Add the fifolog tools to FreeBSD.

Quoth the man-page:

Fifologs provide a compact round-robin circular storage for recording
text and binary information to permanent storage in a bounded and pre-
dictable fashion, time and space wise.

Not yet connected to the build, but feel free to test & review.