FreeDV: Fix memory allocation/free issues. Part of #2315.

plugins/channelrx/demodfreedv/freedvdemod.cpp

@@ -79,6 +79,7 @@ FreeDVDemod::FreeDVDemod(DeviceAPI *deviceAPI) :
 
 FreeDVDemod::~FreeDVDemod()
 {
+    stop();
     QObject::disconnect(
         m_networkManager,
         &QNetworkAccessManager::finished,

plugins/channelrx/demodfreedv/freedvdemodsink.cpp

@@ -176,6 +176,8 @@ FreeDVDemodSink::~FreeDVDemodSink()
 {
     delete SSBFilter;
     delete[] m_SSBFilterBuffer;
+    delete[] m_speechOut;
+    delete[] m_modIn;
 }
 
 void FreeDVDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
@@ -449,7 +451,7 @@ void FreeDVDemodSink::applyFreeDVMode(FreeDVDemodSettings::FreeDVMode mode)
         freedv_set_ext_vco(m_freeDV, 0);
         freedv_set_sync(m_freeDV, FREEDV_SYNC_MANUAL);
 
-        int nSpeechSamples = freedv_get_n_speech_samples(m_freeDV);
+        int nSpeechSamples = freedv_get_n_max_speech_samples(m_freeDV);
         int nMaxModemSamples = freedv_get_n_max_modem_samples(m_freeDV);
         int Fs = freedv_get_modem_sample_rate(m_freeDV);
         int Rs = freedv_get_modem_symbol_rate(m_freeDV);