NFSD: Replace READ* macros in nfsd4_decode_secinfo()

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

fs/nfsd/nfs4xdr.c

@@ -1279,16 +1279,7 @@ static __be32
 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 		     struct nfsd4_secinfo *secinfo)
 {
-	DECODE_HEAD;
-
-	READ_BUF(4);
-	secinfo->si_namelen = be32_to_cpup(p++);
-	READ_BUF(secinfo->si_namelen);
-	SAVEMEM(secinfo->si_name, secinfo->si_namelen);
-	status = check_filename(secinfo->si_name, secinfo->si_namelen);
-	if (status)
-		return status;
-	DECODE_TAIL;
+	return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
 }
 
 static __be32