Samba does not return error when deleting non-existent xattr

[Steve French]

In working on the code to fix the "set zero length xattr deletes the
xattr" problem - I noticed that Samba does not return an error trying
to delete an extended attribute that does not exist (locally ext4 does
return an error when deleting an xattr that does not exist) which made
it a little harder to notice the kernel client problem at first.


-- 
Thanks,

Steve