sunrpc: use sg_init_one() in krb5_rc4_setup_enc/seq_key()

Don't opencode sg_init_one()

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index b5408e8..fee3c15 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -881,9 +881,7 @@
 	if (err)
 		goto out_err;
 
-	sg_init_table(sg, 1);
-	sg_set_buf(sg, &zeroconstant, 4);
-
+	sg_init_one(sg, &zeroconstant, 4);
 	err = crypto_hash_digest(&desc, sg, 4, Kseq);
 	if (err)
 		goto out_err;
@@ -951,9 +949,7 @@
 	if (err)
 		goto out_err;
 
-	sg_init_table(sg, 1);
-	sg_set_buf(sg, zeroconstant, 4);
-
+	sg_init_one(sg, zeroconstant, 4);
 	err = crypto_hash_digest(&desc, sg, 4, Kcrypt);
 	if (err)
 		goto out_err;