Fix some memory leaks.

svn path=/branches/work/kwin_composite/; revision=633714

composite.cpp

@@ -242,6 +242,8 @@ void Workspace::performCompositing()
         }
     foreach( Deleted* c, deleted ) // TODO remember stacking order somehow
         windows.append( c );
+    if( children != NULL )
+        XFree( children );
     foreach( Toplevel* c, windows )
         { // this could be possibly optimized WRT obscuring, but that'd need being already
           // past prePaint() phase - probably not worth it

deleted.cpp

@@ -26,6 +26,7 @@ Deleted::~Deleted()
     {
     assert( delete_refcount == 0 );
     workspace()->removeDeleted( this, Allowed );
+    delete effectWindow();
     }
 
 Deleted* Deleted::create( Toplevel* c )