NFSD: Clean up kdoc for nfsd_file_put_local()
Sparse reports that the synopsis of nfsd_file_put_local() does not
match its kdoc comment. Introduced by commit c25a89770d1f ("nfs_localio:
change nfsd_file_put_local() to take a pointer to __rcu pointer") .
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>