RE: [PATCH v2] exfat: handle unreconized benign secondary entries

["Yuezhang.Mo@xxxxxxxx" <Yuezhang.Mo@xxxxxxxx>]

> +	if (!(flags & ALLOC_FAT_CHAIN) || !start_clu || !size)
> +		return;

>From '7.9.2.2 NoFatChain Field' of the exFAT spec, flags can also be ALLOC_NO_FAT_CHAIN. 

The NoFatChain field shall conform to the definition provided in the Generic Secondary DirectoryEntry template (see Section 6.4.2.2).

> +		if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)
> +			exfat_free_benign_secondary_clusters(inode, ep);
> +

Only vendor allocation entry(0xE1) have associated cluster allocations, vendor extension entry(0xE0) do not have associated cluster allocations.