fuzz: target for stfu

Fuzz the decoding and encoding of stfu.

tests/fuzz/fuzz-wire-stfu.c

@@ -0,0 +1,35 @@
+#include "config.h"
+#include <common/channel_id.h>
+#include <tests/fuzz/libfuzz.h>
+#include <tests/fuzz/wire.h>
+#include <wire/peer_wire.h>
+
+struct stfu {
+	struct channel_id channel_id;
+	u8 initiator;
+};
+
+static void *encode(const tal_t *ctx, const struct stfu *s)
+{
+	return towire_stfu(ctx, &s->channel_id, s->initiator);
+}
+
+static struct stfu *decode(const tal_t *ctx, const void *p)
+{
+	struct stfu *s = tal(ctx, struct stfu);
+
+	if (fromwire_stfu(p, &s->channel_id, &s->initiator))
+		return s;
+	return tal_free(s);
+}
+
+static bool equal(const struct stfu *x, const struct stfu *y)
+{
+	return channel_id_eq(&x->channel_id, &y->channel_id) &&
+	       x->initiator == y->initiator;
+}
+
+void run(const u8 *data, size_t size)
+{
+	test_decode_encode(data, size, WIRE_STFU, struct stfu);
+}