nfsd: move cache proc (un)registration to separate function

Just some minor cleanup.

Also I don't see much point in trying to register further proc entries
if initial entries fail; so just stop trying in that case.

Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
1 file changed