git-bisect.sh: properly dq $GIT_DIR
git-bisect.sh: properly dq $GIT_DIR

Otherwise you would be in trouble if your GIT_DIR has IFS letters in it.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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