Merge branch 'dt/cache-tree-repair'

This fixes a topic that has graduated to 'master'.

* dt/cache-tree-repair:
  t0090: avoid passing empty string to printf %d

t/t0090-cache-tree.sh

@@ -22,7 +22,7 @@ generate_expected_cache_tree_rec () {
 	# ls-files might have foo/bar, foo/bar/baz, and foo/bar/quux
 	# We want to count only foo because it's the only direct child
 	subtrees=$(git ls-files|grep /|cut -d / -f 1|uniq) &&
-	subtree_count=$(echo "$subtrees"|awk '$1 {++c} END {print c}') &&
+	subtree_count=$(echo "$subtrees"|awk -v c=0 '$1 {++c} END {print c}') &&
 	entries=$(git ls-files|wc -l) &&
 	printf "SHA $dir (%d entries, %d subtrees)\n" "$entries" "$subtree_count" &&
 	for subtree in $subtrees