WINGs: Fix crash on exit while trying to save user config changes

Recent patches has introduced the ability to exit cleanly from the WINGs
library, but this introduced some side effects because a function is
registered with 'atexit' to save user config on exit, which may not work
anymore because WMReleaseApplication frees some stuff needed for that task.

This patch handles this so that both method works, in case user of the lib
would forget to call the clean exit function.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

WINGs/wapplication.c

@@ -4,6 +4,7 @@
 
 #include "WINGsP.h"
 #include "wconfig.h"
+#include "userdefaults.h"
 
 
 struct W_Application WMApplication;
@@ -51,6 +52,14 @@ void WMInitializeApplication(const char *applicationName, int *argc, char **argv
 void WMReleaseApplication(void) {
 	int i;
 
+	/*
+	 * We save the configuration on exit, this used to be handled
+	 * through an 'atexit' registered function but if application
+	 * properly calls WMReleaseApplication then the info to that
+	 * will have been freed by us.
+	 */
+	w_save_defaults_changes();
+
 	W_ReleaseNotificationCenter();
 
 	if (WMApplication.applicationName)