PVS-Studio warning V557 for UNRAR

static uint crc_tables[8][256]; // Tables for Slicing-by-8.

void InitCRC()
{
  ....
  for (uint I=0;I<=256;I++)
  {
    uint C=crc_tables[0][I];
    for (uint J=1;J<8;J++)
    {
      C=crc_tables[0][(byte)C]^(C>>8);
      crc_tables[J][I]=C;
    }
  }
  ....
}

This suspicious code was found in UNRAR project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The value of 'I' index could reach 256. crc.cpp 35

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