Reset the sound subsystem if the audio backend is changed. Fixed an array out of bounds error in the sound device selection.

src/wx/cmdevents.cpp

@@ -2462,6 +2462,7 @@ EVT_HANDLER_MASK(SoundConfigure, "Sound options...", CMDEN_NREC_ANY)
 
 	soundSetVolume((float)gopts.sound_vol / 100.0);
 	update_opts();
+	soundReset();
 }
 
 EVT_HANDLER(EmulatorDirectories, "Directories...")

src/wx/guiinit.cpp

@@ -1704,7 +1704,7 @@ public:
 		SoundConfig_t &sch = sound_config_handler;
 		int devs = sch.dev->GetSelection();
 
-		if (!devs)
+		if (devs <= 0)
 			gopts.audio_dev = wxEmptyString;
 		else
 			gopts.audio_dev = sch.dev_ids[devs - 1];