VM Preflet: Use AutoDeleter on the settings

* Prevents a minor memory leak
* Thanks for catching this Axel!

src/preferences/virtualmemory/Settings.cpp

@@ -17,6 +17,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <AutoDeleter.h>
 #include <File.h>
 #include <FindDirectory.h>
 #include <Path.h>
@@ -138,6 +139,8 @@ Settings::ReadSwapSettings()
 	void* settings = load_driver_settings(kVirtualMemorySettings);
 	if (settings == NULL)
 		return kErrorSettingsNotFound;
+	CObjectDeleter<void, status_t> settingDeleter(settings,
+		&unload_driver_settings);
 
 	const char* enabled = get_driver_parameter(settings, "vm", NULL, NULL);
 	const char* automatic = get_driver_parameter(settings, "swap_auto",