grep: enable recurse-submodules to work on <tree> objects

diff --git a/t/t5900-repo-selection.sh b/t/t5900-repo-selection.sh
index 3d5b418bb48ae9fa50411d1c88bc19b3404f1da1..14e59c5b3e4239c3d41d01f3c6a0d821dfe4e260 100755 (executable)
--- a/t/t5900-repo-selection.sh
+++ b/t/t5900-repo-selection.sh
@@ -15,7 +15,7 @@ make_tree() {
 make_bare() {
        git init --bare "$1" &&
        (cd "$1" &&
-        tree=`git hash-object -w -t tree /dev/null` &&
+        tree=$(git hash-object -w -t tree /dev/null) &&
         commit=$(echo "$1" | git commit-tree $tree) &&
         git update-ref HEAD $commit
        )