bsdgrep: fix escape map building when using TRE (BSD_GREP_FASTMATCH)
MFC r317700: bsdgrep: use calloc where appropriate in grep's tre-fastmatch
Also apply style(9) to a related NULL check.
MFC r317701: bsdgrep: correct test sense from r317700
Kyle's change in review D10098 was correct. I introduced the error when
extracting a portion of that change.
MFC r317704: bsdgrep: fix escape map building for multibyte strings
In BSD grep, fix escape map building in the regex parser. It was
previously using memory not explicitly initialized, and the MBS escape
map was being built based on a version of the pattern with escapes
already parsed out.
This is Kyle's change, but I restored the broken style that already
exists in this file.
Approved by: emaste (mentor, blanket MFC)
UnifiedSplitRaw
