[PATCH] Fix git-commit-script to output on stderr when -v fails

[PATCH] Fix git-commit-script to output on stderr when -v fails

When git-commit-script is called with -v option and
verify test fails result is print on stdout
instead of stderr.

[jc: The original patch from Marco updated git-commit-script that
still had the piece of code in question, which has been moved to
an example hook script on its own, so I transplanted the patch to
that new file instead.]

Signed-off-by: Marco Costalba <mcostalba@yahoo.it>
Signed-off-by: Junio C Hamano <junkio@cox.net>