Fix for JVET-P0667 when numQpTables=2 (jointCbCrEnabledFlag is 0 & sameCQPtableForAllChromaFlag is 0).
For JVET-P0667 when numQpTables=2 (jointCbCrEnabledFlag is 0 & sameCQPtableForAllChromaFlag is 0), segmentation fault at the decoder is fixed in this MR.