The rfc doesn't give any reason it shouldn't be possible to set an
attribute on a non-regular file. And if the server supports it, then it
shouldn't be up to us to prevent it.
Thanks to Erez for the report and Trond for further analysis.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Tested-by: Erez Zadok <ezk@cs.sunysb.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>