fmt-merge-msg: avoid early returns
fmt-merge-msg: avoid early returns

In various places in the codepath, the program tries to return early
assuming there is no more work needed. That is generally untrue when
over time new features are added.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git