Fixed bug identifying 'commit-msg' files.

There was a minor typo that would cause repo to (I believe)
mistakenly identify any file that contained a substring of the
word 'commit-msg' as a commit message hook.  For example, the file
'mit' or the file 'msg' would be treated as a commit message hook.
I believe that it was intended that repo only recognize files
named exactly 'commit-msg'.

Change-Id: I93edbddf3da3cf0935641e6efb19b0a8ee6e2308
1 file changed