Frees memory allocated
in TVScreenAnalog::initializeGL() /home/daniele/Programmazione/ham/sdrangel/sdrgui/gui/tvscreenanalog.cpp:232
in TVScreenAnalog::initializeTextures(TVScreenAnalogBuffer*) /home/daniele/Programmazione/ham/sdrangel/sdrgui/gui/tvscreenanalog.cpp:285
in TVScreenAnalog::initializeTextures(TVScreenAnalogBuffer*) /home/daniele/Programmazione/ham/sdrangel/sdrgui/gui/tvscreenanalog.cpp:286