- audio_oss_esd.cpp (open_esd): even return false if !ENABLE_ESD and shut

up the compiler by the way

BasiliskII/src/Unix/audio_oss_esd.cpp

@@ -231,6 +231,9 @@ static bool open_esd(void)
 	// Sound buffer size = 4096 frames
 	audio_frames_per_block = 4096;
 	return true;
+#else
+	// ESD is not enabled, shut up the compiler
+	return false;
 #endif
 }