Fix stack buffer overflow in HUF_readCTable()
Fix stack buffer overflow in HUF_readCTable()

If `w ==0` on line 153, then `CTable[n].nbBits == tableLog + 1`.
Then `nbPerRank[CTable[n].nbBits]` and `valPerRank[CTable[n].nbBits]`
are stack buffer overflows.

ds77/zstd,Cyan4973/zstd,inikep/zstd,Majlen/zstd,Cyan4973/zstd,Majlen/zstd,Majlen/zstd,inikep/zstd,Cyan4973/zstd,inikep/zstd,Cyan4973/zstd,Cyan4973/zstd,ds77/zstd,inikep/zstd,ds77/zstd,ds77/zstd,Majlen/zstd