[PATCH] filter-branch: use printf instead of echo -e

[Michele Locati <michele@locati.it>]

In order to echo a tab character, it's better to use printf instead of
"echo -e", because it's more portable (for instance, "echo -e" doesn't work
as expected on a Mac).

This solves the "fatal: Not a valid object name" error in git-filter-branch
when using the --state-branch option.

Signed-off-by: Michele Locati <michele@locati.it>
---
 git-filter-branch.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 1b7e4b2cd..21d84eff3 100755
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -627,7 +627,7 @@ then
 				print H "$_:$f\n" or die;
 			}
 			close(H) or die;' || die "Unable to save state")
-	state_tree=$(/bin/echo -e "100644 blob $state_blob\tfilter.map" | git mktree)
+	state_tree=$(printf '100644 blob %s\tfilter.map\n' "$state_blob" | git mktree)
 	if test -n "$state_commit"
 	then
 		state_commit=$(/bin/echo "Sync" | git commit-tree "$state_tree" -p "$state_commit")
-- 
2.16.2.windows.1