Disable OpenHMD dummy device for release builds

Also fixing warning.

source/blender/windowmanager/intern/wm_device.c

@@ -51,7 +51,14 @@
 
 int WM_device_HMD_num_devices_get(void)
 {
-	return GHOST_HMDgetNumDevices();
+	const int tot_devices = GHOST_HMDgetNumDevices();
+
+#ifdef NDEBUG
+	/* OpenHMD always places the dummy device last, we don't want to display it in non-debug builds. */
+	return tot_devices - 1;
+#else
+	return tot_devices;
+#endif
 }
 
 /**

source/blender/windowmanager/intern/wm_window.c

@@ -674,7 +674,7 @@ static bool wm_window_setup_type(bContext *C, Scene *scene, wmWindow *win, rcti
 	sa = win->screen->areabase.first;
 	CTX_wm_area_set(C, sa);
 
-	int spacetype;
+	int spacetype = SPACE_EMPTY;
 	switch (type) {
 		case WM_WINDOW_RENDER:
 			spacetype = SPACE_IMAGE;