Andreas Jaeger f5145cf8ee Unify usages of checking for existing changes (2/2)
Use function setup_commit_message everywhere to avoid duplication of
these lines.
Also, document the side effects of the function in the invocation.

Change-Id: I3b77a232467b536b62b5c61d30705deeb11e725e
2016-01-08 09:28:38 +01:00
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