Fixed item-breaking.

This fixes #232.

source/Inventory.cpp

@@ -374,7 +374,7 @@ bool cInventory::DamageItem(int a_SlotNum, short a_Amount)
 	}
 	
 	// The item has broken, remove it:
-	Grid->EmptySlot(a_SlotNum);
+	Grid->EmptySlot(GridSlotNum);
 	return true;
 }