Fix GSM decodding checksum after generate_silence() has been implemented.
Fix GSM decodding checksum after generate_silence() has been
implemented.

dsanders11/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,Vocalocity/rtpproxy-pre,dsanders11/rtpproxy,jevonearth/rtpproxy,Vocalocity/rtpproxy-pre,jevonearth/rtpproxy,synety-jdebp/rtpproxy,hongbinz/rtpproxy,synety-jdebp/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy,sippy/rtpproxy,Vocalocity/rtpproxy-pre,synety-jdebp/rtpproxy,hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,hongbinz/rtpproxy,jevonearth/rtpproxy,hongbinz/rtpproxy,sippy/rtpproxy