wt-status: release strbuf after use in read_rebase_todolist()

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

wt-status.c

@@ -1193,6 +1193,7 @@ static int read_rebase_todolist(const char *fname, struct string_list *lines)
 		string_list_append(lines, line.buf);
 	}
 	fclose(f);
+	strbuf_release(&line);
 	return 0;
 }