Fixed implicit widening multiplication error, Removed unused "this", Fixed narrowing conversion, Made m_verified and m_invalid mutable, Removed else-after-return, Removed unused num_full_blocks and last_block_size var all to make clang-tidy happy

src/p2p_server.cpp

@@ -3158,7 +3158,7 @@ bool P2PServer::P2PClient::on_genesis_info(const uint8_t* buf)
 	if (!server->find_block(peer_genesis_id)) {
 		LOGINFO(5, "Requesting genesis block " << peer_genesis_id << " from peer");
 		const bool result = server->send(this,
-			[&peer_genesis_id, this](uint8_t* buf, size_t buf_size) -> size_t
+			[&peer_genesis_id](uint8_t* buf, size_t buf_size) -> size_t
 			{
 				if (buf_size < 1 + HASH_SIZE) {
 					return 0;