Skip git log message when extracting filenames

Commit message may include file names which are not to be
considered for code style checking.

Using a format="" make sure that all the commit releated
text is omitted.

Change-Id: I85770b1e4a7f8b40f39f1112f6b0649fd6909303
1 file changed
tree: 610a3bd8f25b9d5ca5005ec3a87374aeb96e210d
  1. jenkins/
  2. jenkins-docker/
  3. .gitignore