Make the 'lock file' exists error more informative
Make the 'lock file' exists error more informative

It looks like someone did 90% of the work, then forgot to actually use
the function in one place.

Also the helper function did not use the correct variable.

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