Fix warnings

libs/ardour/audioengine.cc

@@ -776,12 +776,14 @@ AudioEngine::backend_discover (const string& path)
 	return info;
 }
 
+#ifdef NDEBUG
 static bool running_from_source_tree ()
 {
 	// dup ARDOUR_UI_UTILS::running_from_source_tree ()
 	gchar const *x = g_getenv ("ARDOUR_THEMES_PATH");
 	return x && (string (x).find ("gtk2_ardour") != string::npos);
 }
+#endif
 
 vector<const AudioBackendInfo*>
 AudioEngine::available_backends() const

libs/ardour/buffer_set.cc

@@ -362,9 +362,9 @@ BufferSet::get_vst_midi (size_t b)
 }
 
 BufferSet::VSTBuffer::VSTBuffer (size_t c)
-  : _capacity (c)
-  , _events (0)
-  , _midi_events (0)
+	: _events (0)
+	, _midi_events (0)
+	, _capacity (c)
 {
 	if (_capacity > 0) {
 		/* from `man malloc`: "If size is 0, then malloc() returns either NULL, or a