`git diff` creates diffs where the file name starts with `a/` or `b/`
respectively. These are obviously not in path, so the Github annotations
point to nowhere when the path is used without accounting for this.
This fixes the GH annotation parsing to account for that.
Previously, uncrustify.sh would fail (report uncrustifying necessary) if
there was any output of uncrustify. Turns out uncrustify sometimes
outputs something.
This commit changes the logic to use uncrustify's output value as
indicator.
Also, adds printing which file causes the check to fail.
