NFSD: Update GETATTR3args decoder to use struct xdr_stream

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index c9c6447..4b66f055 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -683,7 +683,6 @@ nfsd3_proc_commit(struct svc_rqst *rqstp)
  * NFSv3 Server procedures.
  * Only the results of non-idempotent operations are cached.
  */
-#define nfs3svc_decode_fhandleargs	nfs3svc_decode_fhandle
 #define nfs3svc_encode_attrstatres	nfs3svc_encode_attrstat
 #define nfs3svc_encode_wccstatres	nfs3svc_encode_wccstat
 #define nfsd3_mkdirargs			nfsd3_createargs
@@ -715,7 +714,7 @@ static const struct svc_procedure nfsd_procedures3[22] = {
 		.pc_decode = nfs3svc_decode_fhandleargs,
 		.pc_encode = nfs3svc_encode_attrstatres,
 		.pc_release = nfs3svc_release_fhandle,
-		.pc_argsize = sizeof(struct nfsd3_fhandleargs),
+		.pc_argsize = sizeof(struct nfsd_fhandle),
 		.pc_ressize = sizeof(struct nfsd3_attrstatres),
 		.pc_cachetype = RC_NOCACHE,
 		.pc_xdrressize = ST+AT,