filter-branch: make sure orig_namespace ends with a single slash.

Later in a loop any existing ref whose path begins with it is
removed.  It would be a disaster if you allowed it to say refs/head
for example.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index ec2f75de56..c166c978ec 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -140,7 +140,7 @@ do
 		filter_subdir="$OPTARG"
 		;;
 	--original)
-		orig_namespace="$OPTARG"
+		orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/
 		;;
 	*)
 		usage