Include test when NDEBUG is not defined (checking for DEBUG was

the wrong thing to do when building in release with assertions on)

test/test_dbuf.c

@@ -89,7 +89,7 @@ Suite *dbuf_suite(void)
     Suite *s = suite_create("dbuf");
     TCase *tc = tcase_create("dbuf tests");
     tcase_add_test(tc, test_dbuf);
-#ifdef DEBUG
+#ifndef NDEBUG
     tcase_add_test_raise_signal(tc, test_dbuf_take_fail, SIGABRT);
 #else
     tcase_add_test(tc, test_dbuf_take_fail);