Fix up some locking issues in task inventory. Don't use any prior versions in production!

OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs

@@ -959,6 +959,7 @@ namespace OpenSim.Region.Framework.Scenes
             if (m_inventorySerial == 0) // No inventory
             {
                 client.SendTaskInventory(m_part.UUID, 0, new byte[0]);
+                Items.LockItemsForRead(false);
                 return;
             }
 
@@ -971,6 +972,7 @@ namespace OpenSim.Region.Framework.Scenes
                 {
                     xferManager.AddNewFile(m_inventoryFileName,
                             m_inventoryFileData);
+                    Items.LockItemsForRead(false);
                     return;
                 }
             }