nfsd4: minor nfs4state.c reshuffling

commit 529d7b2a upstream.

Minor cleanup in preparation for a bugfix--moving some code to avoid
forward references, etc.  No change in functionality.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>