Don't crash if exiting on panic

include/core/audioapi.hpp

@@ -283,6 +283,11 @@ void audioapi_driver_init() throw();
  */
 void audioapi_driver_quit() throw();
 
+/**
+ * Panic notification.
+ */
+void audioapi_panicing() throw();
+
 /**
  * Enable or disable sound.
  *

src/core/audioapi.cpp

@@ -18,6 +18,7 @@
 
 namespace
 {
+	bool paniced = false;
 	const unsigned voicep_bufsize = 65536;
 	const unsigned voicer_bufsize = 65536;
 	const unsigned music_bufsize = 8192;
@@ -506,6 +507,8 @@ void audioapi_vumeter::operator()(float* asamples, size_t count, bool stereo, do
 
 void audioapi_vumeter::update_vu()
 {
+	if(paniced)
+		return;
 	if(!samples) {
 		vu = -999.0;
 		accumulator = 0;
@@ -522,6 +525,11 @@ void audioapi_vumeter::update_vu()
 	CORE().dispatch->vu_change();
 }
 
+void audioapi_panicing() throw()
+{
+	paniced = true;
+}
+
 //VU values.
 audioapi_vumeter audioapi_vu_mleft;
 audioapi_vumeter audioapi_vu_mright;

src/core/window.cpp

@@ -228,6 +228,7 @@ void platform::fatal_error() throw()
 	system_log << "-----------------------------------------------------------------------" << std::endl;
 	system_log.close();
 	graphics_driver_fatal_error();
+	audioapi_panicing();	//Don't call update VU, as that crashes.
 	exit(1);
 }