API GetInventoryItemBroken

Returns true if an inventory item has zero durability.
 isBroken = GetInventoryItemBroken(unit, invSlotId)
==Arguments==
:;unit: : UnitId - The unit whose inventory is to be queried.
:;invSlotId: : InventorySlotId - to be queried, obtained via GetInventorySlotInfo.
==Returns==
:;isBroken:Flag - Returns nil if the specified item is not broken, or 1 if it is.