NFS4: Fix incorrect use of sizeof() in fs/nfs/nfs4xdr.c

The XDR code should not depend on the physical allocation size of
structures like nfs4_stateid and nfs4_verifier since those may have to
change at some future date. We therefore replace all uses of
sizeof() with constants like NFS4_VERIFIER_SIZE and NFS4_STATEID_SIZE.

This also has the side-effect of fixing some warnings of the type
	format ‘%u’ expects type ‘unsigned int’, but argument X has type
		‘long unsigned int’
on 64-bit systems

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

include/linux/nfs4.h

@@ -16,6 +16,7 @@
 #include <linux/types.h>
 
 #define NFS4_VERIFIER_SIZE	8
+#define NFS4_STATEID_SIZE	16
 #define NFS4_FHSIZE		128
 #define NFS4_MAXPATHLEN		PATH_MAX
 #define NFS4_MAXNAMLEN		NAME_MAX
@@ -113,7 +114,7 @@ struct nfs4_acl {
 };
 
 typedef struct { char data[NFS4_VERIFIER_SIZE]; } nfs4_verifier;
-typedef struct { char data[16]; } nfs4_stateid;
+typedef struct { char data[NFS4_STATEID_SIZE]; } nfs4_stateid;
 
 enum nfs_opnum4 {
 	OP_ACCESS = 3,