fixup! sparse-checkout: add basics of 'clean' command

Author: derrickstolee

builtin/sparse-checkout.c

@@ -938,6 +938,7 @@ static int sparse_checkout_clean(int argc, const char **argv,
 				   struct repository *repo)
 {
 	struct strbuf full_path = STRBUF_INIT;
+	const char *msg = msg_remove;
 	size_t worktree_len;
 	int force = 0;
 	int dry_run = 0;