cleanup, fixed some warnings

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21128 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/print/FolderWatcher.h

@@ -42,6 +42,7 @@
 
 class FolderListener {
 public:
+	virtual ~FolderListener() {};
 		// entry created or moved into folder
 	virtual void EntryCreated(node_ref* node, entry_ref* entry) {};
 		// entry removed from folder (or moved to another folder) 

src/apps/expander/DirectoryFilePanel.h

@@ -49,6 +49,7 @@ class DirectoryFilePanel : public BFilePanel {
 			uint32 node_flavors = 0, bool allow_multiple_selection = true,
 			BMessage *message = 0, BRefFilter * = 0,
 			bool modal = false, bool hide_when_done = true);
+		virtual ~DirectoryFilePanel() {};
 		virtual void SelectionChanged(void);
 		virtual void Show();
 

src/apps/expander/GenericThread.h

@@ -24,7 +24,7 @@ class GenericThread
 		status_t	Kill(void);
 
 		void		ExitWithReturnValue(status_t a_return_value);
-		status_t	SetExitCallback(void(* a_callback)(void *), void * a_data);
+		status_t	SetExitCallback(void (* a_callback)(void *), void * a_data);
 		status_t	WaitForThread(status_t * a_exit_value);
 
 		status_t	Rename(char * a_name);

src/apps/soundrecorder/DrawingTidbits.h

@@ -47,4 +47,5 @@ const float kDimLevel = 0.6;
 void ReplaceColor(BBitmap *bitmap, rgb_color from, rgb_color to);
 void ReplaceTransparentColor(BBitmap *bitmap, rgb_color with);
 
-#endif
+#endif
+

src/servers/app/EventDispatcher.h

@@ -56,6 +56,7 @@ class EventTarget {
 
 class EventFilter {
 	public:
+		virtual ~EventFilter() {};
 		virtual filter_result Filter(BMessage* event, EventTarget** _target,
 			int32* _viewToken = NULL, BMessage* latestMouseMoved = NULL) = 0;
 		virtual void RemoveTarget(EventTarget* target);

src/servers/app/FontFamily.h

@@ -49,6 +49,7 @@ class FontKey : public Hashable {
 			: fHash(familyID | (styleID << 16UL))
 		{
 		}
+		virtual ~FontKey() {};
 
 		virtual uint32	Hash() const
 							{ return fHash; }

src/servers/app/HashTable.h

@@ -14,6 +14,7 @@
 
 class Hashable {
 	public:
+		virtual ~Hashable() {};
 		virtual uint32 Hash() const = 0;
 		virtual bool CompareTo(Hashable& hashable) const = 0;
 };

src/servers/app/ScreenManager.h

@@ -24,6 +24,7 @@ typedef BObjectList<Screen> ScreenList;
 
 class ScreenOwner {
 	public:
+		virtual ~ScreenOwner() {};
 		virtual void	ScreenRemoved(Screen* screen) = 0;
 		virtual void	ScreenAdded(Screen* screen) = 0;