tests/test-check-jshint.t

match: small tweak to PatternMatcher.visit_children_set

This makes it a bit more efficient (avoid a computation in case of early
return), and in my opinion clearer.

#require test-repo jshint hg10

  $ . "$TESTDIR/helpers-testrepo.sh"

run jshint on all tracked files ending in .js except vendored dependencies

  $ cd "`dirname "$TESTDIR"`"

  $ testrepohg locate 'set:**.js' \
  > 2>/dev/null \
  > | xargs jshint