macosx: Fix crash with hero view badly using just instantiated object…

…'s property

Signed-off-by: Claudio Cambra <[email protected]>

modules/gui/macosx/library/VLCLibraryHeroView.m

@@ -199,7 +199,9 @@ - (void)itemUpdated:(NSNotification *)notification
         return;
     }
 
-    VLCLibraryRepresentedItem * const item = [[VLCLibraryRepresentedItem alloc] initWithItem:mediaItem parentType:item.parentType];
+    VLCLibraryRepresentedItem * const item =
+        [[VLCLibraryRepresentedItem alloc] initWithItem:mediaItem
+                                             parentType:self.representedItem.parentType];
     self.representedItem = item;
 }