make-authors.pl checks that .git exists and is a directory before
getting the git log - but when a repo is checked out as a submodule of a
larger repository, .git is not a directory, it's just a text file. This
can cause make-authors.pl to terminate inappropriately.
Author: Michael Heinz <michael.william.heinz@intel.com>
Signed-off-by: Michael Heinz <michael.william.heinz@intel.com>
0a8fa5439c