filter-branch: get rid of "set -e"
filter-branch: get rid of "set -e"

It was reported by Alex Riesen that "set -e" can break something as
trivial as "unset CDPATH" in bash.

So get rid of "set -e".

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>
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