NLM: fix parsing of sm notify procedure

 The procedure that decodes statd sm_notify call seems to be skipping a
 few arguments.  How did this ever work?

 >From folks at Polyserve.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>