misc: fix uninitialised errors for macOS

MacOS SDK is quite strict so treats these uninitialised variable warnings as errors.

Author: sangbida

common/test/run-trace.c

@@ -8,7 +8,7 @@
 int main(int argx, char *argv[])
 {
 	/* Just some context objects to hang spans off of. */
-	int a, b, c, d;
+	int a = 0, b = 0, c = 0, d = 0;
 
 	common_setup(argv[0]);
 

devtools/mkquery.c

@@ -17,7 +17,7 @@ int main(int argc, char *argv[])
 {
 	struct bitcoin_blkid chainhash;
 	const tal_t *ctx = tal(NULL, char);
-	const u8 *msg;
+	const u8 *msg = NULL;
 
 	setup_locale();
 	secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY |
@@ -36,7 +36,7 @@ int main(int argc, char *argv[])
 						     strtol(argv[3], NULL, 0),
 						     strtol(argv[4], NULL, 0));
 	} else if (streq(argv[1], "query_channel_range")) {
-		struct tlv_query_channel_range_tlvs *tlvs;
+		struct tlv_query_channel_range_tlvs *tlvs = NULL;
 		if (argc == 5)
 			tlvs = NULL;
 		else if (argc == 6) {
@@ -50,7 +50,7 @@ int main(int argc, char *argv[])
 						 strtol(argv[4], NULL, 0),
 						 tlvs);
 	} else if (streq(argv[1], "query_short_channel_ids")) {
-		struct tlv_query_short_channel_ids_tlvs *tlvs;
+		struct tlv_query_short_channel_ids_tlvs *tlvs = NULL;
 		u8 *encoded;
 
 		if (argc == 4)

lightningd/dual_open_control.c

@@ -2254,7 +2254,7 @@ static bool verify_option_will_fund_signature(struct peer *peer,
 static void handle_validate_lease(struct subd *dualopend,
 				  const u8 *msg)
 {
-	const secp256k1_ecdsa_signature sig;
+	secp256k1_ecdsa_signature sig = {{0}};
 	u16 chan_fee_max_ppt;
 	u32 chan_fee_max_base_msat, lease_expiry;
 	struct pubkey their_pubkey;

openingd/dualopend.c

@@ -2794,7 +2794,6 @@ static u8 *opener_commits(struct state *state,
 			  struct amount_sat total,
 			  char **err_reason)
 {
-	struct channel_id cid;
 	struct amount_msat our_msats;
 	struct penalty_base *pbase;
 	struct bitcoin_tx *local_commit;
@@ -2853,7 +2852,7 @@ static u8 *opener_commits(struct state *state,
 
 	tal_free(state->channel);
 	state->channel = new_initial_channel(state,
-					     &cid,
+					     &state->channel_id,
 					     &tx_state->funding,
 					     state->minimum_depth,
 					     take(new_height_states(NULL, LOCAL,