message: fixing memleak in verify section
diff: @@ -560,6 +560,7 @@ bool mtp_verify(const char* input, const uint32_t target,
  blake2b_update(&ctx_yj, &Y[j - 1], 32);
  blake2b_update(&ctx_yj, blockhash_bytes, ARGON2_BLOCK_SIZE);
  blake2b_final(&ctx_yj, &Y[j], 32);
  + clear_internal_memory(block_ij.v, ARGON2_BLOCK_SIZE);
  clear_internal_memory(blockhash.v, ARGON2_BLOCK_SIZE);
  clear_internal_memory(blockhash_bytes, ARGON2_BLOCK_SIZE);
  