Merge branch 'jk/revision-walk-stop-at-max-count'

"git log -n 1 -- rarely-touched-path" was spending unnecessary
cycles after showing the first change to find the next one, only to
discard it.

* jk/revision-walk-stop-at-max-count:
  revision: avoid work after --max-count is reached

diff --cc revision.c
Simple merge