Merge branch 'jk/subtree-do-not-push-if-split-fails' into maint

* jk/subtree-do-not-push-if-split-fails:
  contrib/subtree: don't delete remote branches if split fails

contrib/subtree/git-subtree.sh

@@ -715,7 +715,8 @@ cmd_push()
 	if [ -e "$dir" ]; then
 	    repository=$1
 	    refspec=$2
-	    echo "git push using: " $repository $refspec
+	    echo "git push using: " $repository $refspec
+	    localrev=$(git subtree split --prefix="$prefix") || die
 	    git push $repository $localrev:refs/heads/$refspec
 	else
 	    die "'$dir' must already exist. Try 'git subtree add'."