JBM MASA DTX sid start crashes

Basic info

• Commit SHA: 8e40fa16
• Platform: all

Bug description

JBM has a function that determines the number of transport channels that need to go through the time scale modification. In case of MASA with DTX and decoding to STEREO with the first frame beeing a sid frame, it tries to access the first CPE handle which is still NULL at this point.

Ways to reproduce

Run the following command line with this VoIP bitstream masa_nws.192

IVAS_dec -voip STEREO 48 masa_nws.192 masa_nws_dec.wav