fuzzing BUGFIX fuzz harnesses

Update lys_parse_mem and lyd_parse_mem fuzz harnesses to work with API
changes introduced in 7931b19.
diff --git a/tests/fuzz/lys_parse_mem.c b/tests/fuzz/lys_parse_mem.c
index 516a6d9..59884f3 100644
--- a/tests/fuzz/lys_parse_mem.c
+++ b/tests/fuzz/lys_parse_mem.c
@@ -30,7 +30,7 @@
 	memcpy(data, buf, len);
 	data[len] = 0;
 
-	lys_parse_mem(ctx, data, LYS_IN_YANG);
+	lys_parse_mem(ctx, data, LYS_IN_YANG, NULL);
 	ly_ctx_destroy(ctx, NULL);
 	free(data);
 	return 0;