HCA unpacker fixes
HCA unpacker fixes

- Optimize checking for empty frames. If the scale factor delta size for all the channels is zero, the frame is empty.
- Get rid of false negatives when checking if an unpack was successful.

Thealexbarney/LibDspAdpcm,Thealexbarney/LibDspAdpcm,Thealexbarney/VGAudio,Thealexbarney/VGAudio