[#1722] Forgot Sdes case for Stop rtp session method

sflphone-common/src/audio/audiortp/AudioRtpFactory.cpp

@@ -171,6 +171,8 @@ void AudioRtpFactory::stop (void)
         switch (_rtpSessionType) {
 
             case Sdes:
+	        delete static_cast<AudioSrtpSession *> (_rtpSession);
+		break;
 
             case Symmetric:
                 delete static_cast<AudioSymmetricRtpSession *> (_rtpSession);