app_server/Screen: fix finalization order to avoid use after free

Change-Id: I41ba464a365be9449dfd47b2248746b9a338769e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7416
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Axel Dörfler <axeld@pinc-software.de>

src/servers/app/Screen.cpp

@@ -42,8 +42,8 @@ get_mode_frequency(const display_mode& mode)
 Screen::Screen(::HWInterface *interface, int32 id)
 	:
 	fID(id),
-	fDriver(interface ? interface->CreateDrawingEngine() : NULL),
-	fHWInterface(interface)
+	fHWInterface(interface),
+	fDriver(interface != NULL ? interface->CreateDrawingEngine() : NULL)
 {
 }
 

src/servers/app/Screen.h

@@ -61,10 +61,10 @@ private:
 									uint32 colorspace, float frequency) const;
 
 			int32				fID;
-			ObjectDeleter<DrawingEngine>
-								fDriver;
 			ObjectDeleter< ::HWInterface>
 								fHWInterface;
+			ObjectDeleter<DrawingEngine>
+								fDriver;
 };
 
 #endif	/* SCREEN_H */