reftable: ignore remove() return value in stack_test.c

If the cleanup fails, there is nothing we can do.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

reftable/stack_test.c

@@ -89,7 +89,7 @@ static void test_read_file(void)
 		EXPECT(0 == strcmp(want[i], names[i]));
 	}
 	free_names(names);
-	remove(fn);
+	(void) remove(fn);
 }
 
 static void test_parse_names(void)