nfsd: use timespec64 in encode_time_delta

The values in encode_time_delta are always small and don't
overflow the range of 'struct timespec', so changing it has
no effect.

Change it to timespec64 as a prerequisite for removing the
timespec definition later.

Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: J. Bruce Fields <[e-mail]>

fs/nfsd/nfs4xdr.c

···
  */
 static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
 {
-	struct timespec ts;
+	struct timespec64 ts;
 	u32 ns;
 
 	ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
-	ts = ns_to_timespec(ns);
+	ts = ns_to_timespec64(ns);
 
 	p = xdr_encode_hyper(p, ts.tv_sec);
 	*p++ = cpu_to_be32(ts.tv_nsec);