Fixed CID 321, 868: check item for NULL and delete recource leak

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27453 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/preferences/filetypes/ApplicationTypeWindow.cpp

@@ -703,6 +703,7 @@ ApplicationTypeWindow::_Save()
 		SupportedTypeItem* item = dynamic_cast<SupportedTypeItem*>(
 			fTypeListView->ItemAt(i));
 
+		if (item != NULL)
 			supportedTypes.AddString("types", item->Type());
 	}
 
@@ -735,6 +736,7 @@ ApplicationTypeWindow::_Save()
 		SupportedTypeItem* item = dynamic_cast<SupportedTypeItem*>(
 			fTypeListView->ItemAt(i));
 
+		if (item != NULL)
 			item->Icon().CopyTo(info, item->Type(), true);
 	}
 }

src/preferences/filetypes/IconView.cpp

@@ -591,10 +591,15 @@ IconView::MessageReceived(BMessage* message)
 
 		if (large != NULL || mini != NULL || (data != NULL && size > 0))
 			_SetIcon(large, mini, data, size);
-
+		else {
 			entry_ref ref;
 			if (message->FindRef("refs", &ref) == B_OK)
 				_SetIcon(&ref);
+		}
+			
+		delete(large);
+		delete(mini);
+		delete(data);
 
 		return;
 	}