Fix neglect of diff_setup()/diff_setup_done() symmetry.
Fix neglect of diff_setup()/diff_setup_done() symmetry.

Code that calls diff_setup(), including via init_revisions(), should later call
diff_setup_done(), possibly via setup_revisions(). Failure to do so could cause
errors, especially in the future when we add responsibilities to
diff_setup_done(). This instance causes no known errors with the present code.
But it resulted in an error with an experimental patch.

Signed-off-by: Keith Cascio <0ccc0848a69a0c9f60128cfc9721e973b7acd43f@cs.ucla.edu>
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