fuzz-tests: Add fuzz target for closing_complete

tests/fuzz/corpora/fuzz-wire-closing_complete/2222e35a21d132ff116c514ca70f1d76d482deea

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tests/fuzz/corpora/fuzz-wire-closing_complete/3cab1f0656bc277f02fb567b71862789ead1c4e3

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tests/fuzz/corpora/fuzz-wire-closing_complete/5d0907b00dd2d253324b128262eddbf9e5999caf

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tests/fuzz/corpora/fuzz-wire-closing_complete/5d6d55ad31d0b291495e213354e57a74205e71fe

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tests/fuzz/corpora/fuzz-wire-closing_complete/734ac097627429ebbdb2d534383eafcb1da9580d

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tests/fuzz/corpora/fuzz-wire-closing_complete/b54664965911c6fe91e18cd01b68a75c8183b530

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tests/fuzz/fuzz-wire-closing_complete.c

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+#include "config.h"
+#include <assert.h>
+#include <ccan/mem/mem.h>
+#include <tests/fuzz/libfuzz.h>
+#include <tests/fuzz/wire.h>
+#include <wire/peer_wire.h>
+
+struct closing_complete {
+	struct channel_id channel_id;
+	u32 locktime;
+	struct amount_sat fee_satoshis;
+	u8 *closer_scriptpubkey, *closee_scriptpubkey;
+	struct tlv_closing_tlvs *tlvs;
+};
+
+static void *encode(const tal_t *ctx, const struct closing_complete *s)
+{
+	return towire_closing_complete(ctx, &s->channel_id, s->closer_scriptpubkey,
+					s->closee_scriptpubkey, s->fee_satoshis, s->locktime, s->tlvs);
+}
+
+static struct closing_complete *decode(const tal_t *ctx, const void *p)
+{
+	struct closing_complete *s = tal(ctx, struct closing_complete);
+
+	if (fromwire_closing_complete(s, p, &s->channel_id, &s->closer_scriptpubkey,
+					&s->closee_scriptpubkey, &s->fee_satoshis, &s->locktime, &s->tlvs))
+		return s;
+	return tal_free(s);
+}
+
+static bool equal(const struct closing_complete *x,
+		  const struct closing_complete *y)
+{
+	assert(memcmp(&x->channel_id, &y->channel_id, sizeof(x->channel_id)) == 0);
+	assert(x->locktime == y->locktime);
+	assert(memcmp(&x->fee_satoshis, &y->fee_satoshis, sizeof(x->fee_satoshis)) == 0);
+
+	assert(tal_arr_eq(x->closer_scriptpubkey, y->closer_scriptpubkey));
+	assert(tal_arr_eq(x->closee_scriptpubkey, y->closee_scriptpubkey));
+
+	assert(x->tlvs && y->tlvs);
+	return tal_arr_eq(x->tlvs->closer_and_closee_outputs, y->tlvs->closer_and_closee_outputs);
+}
+
+void run(const u8 *data, size_t size)
+{
+	test_decode_encode(data, size, WIRE_CLOSING_COMPLETE,
+			   struct closing_complete);
+}