really add source for authopt_fuzz this time

regress/misc/fuzz-harness/authopt_fuzz.cc

@@ -0,0 +1,33 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+extern "C" {
+
+#include "auth-options.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+	char *cp = (char *)malloc(size + 1);
+	struct sshauthopt *opts = NULL, *merge = NULL, *add = sshauthopt_new();
+
+	if (cp == NULL || add == NULL)
+		goto out;
+	memcpy(cp, data, size);
+	cp[size] = '\0';
+	if ((opts = sshauthopt_parse(cp, NULL)) == NULL)
+		goto out;
+	if ((merge = sshauthopt_merge(opts, add, NULL)) == NULL)
+		goto out;
+
+ out:
+	free(cp);
+	sshauthopt_free(add);
+	sshauthopt_free(opts);
+	sshauthopt_free(merge);
+	return 0;
+}
+
+} // extern "C"