Reduce memory usage in git-update-server-info.

Modify parse_object_cheap() to also free all the entries from the tree
data structures.

Signed-off-by: Robert Fitzsimons <robfitz@273k.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

server-info.c

@@ -59,6 +59,16 @@ static struct object *parse_object_cheap(const unsigned char *sha1)
 		struct commit *commit = (struct commit *)o;
 		free(commit->buffer);
 		commit->buffer = NULL;
+	} else if (o->type == tree_type) {
+		struct tree *tree = (struct tree *)o;
+		struct tree_entry_list *e, *n;
+		for (e = tree->entries; e; e = n) {
+			free(e->name);
+			e->name = NULL;
+			n = e->next;
+			free(e);
+		}
+		tree->entries = NULL;
 	}
 	return o;
 }