transport: simplify duplicating a substring in transport_get() using xmemdupz()

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 86d6994619151fb63327848e6763b07971017ad7..e6e99f5bb5102d394a25f156dbcba956f246054b 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -332,7 +332,13 @@ while read commit parents; do
        parentstr=
        for parent in $parents; do
                for reparent in $(map "$parent"); do
-                       parentstr="$parentstr -p $reparent"
+                       case "$parentstr " in
+                       *" -p $reparent "*)
+                               ;;
+                       *)
+                               parentstr="$parentstr -p $reparent"
+                               ;;
+                       esac
                done
        done
        if [ "$filter_parent" ]; then