ACKVEC: remove unused variables

index bc5ff12..4d176d3 100644
@@ -142,14 +142,13 @@ struct dccp_ackvec *dccp_ackvec_alloc(co
 	struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
 
 	if (av != NULL) {
-		av->dccpav_buf_head	-			av->dccpav_buf_tail = DCCP_MAX_ACKVEC_LEN - 1;
+		av->dccpav_buf_head	= DCCP_MAX_ACKVEC_LEN - 1;
 		av->dccpav_buf_ackno	= DCCP_MAX_SEQNO + 1;
 		av->dccpav_buf_nonce = av->dccpav_buf_nonce = 0;
 		av->dccpav_ack_ptr	= 0;
 		av->dccpav_time.tv_sec	= 0;
 		av->dccpav_time.tv_usec	= 0;
-		av->dccpav_sent_len	= av->dccpav_vec_len = 0;
+		av->dccpav_vec_len	= 0;
 		INIT_LIST_HEAD(&av->dccpav_records);
 	}
 

index ec7a89b..ec9a988 100644
@@ -55,9 +55,7 @@ struct dccp_ackvec {
 	struct list_head dccpav_records;
 	struct timeval	dccpav_time;
 	u8		dccpav_buf_head;
-	u8		dccpav_buf_tail;
 	u8		dccpav_ack_ptr;
-	u8		dccpav_sent_len;
 	u8		dccpav_vec_len;
 	u8		dccpav_buf_nonce;
 	u8		dccpav_ack_nonce;

@@ -108,7 +106,7 @@ extern int dccp_insert_option_ackvec(str
 
 static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
 {
-	return av->dccpav_sent_len != av->dccpav_vec_len;
+	return av->dccpav_vec_len;
 }
 #else /* CONFIG_IP_DCCP_ACKVEC */
 static inline int dccp_ackvec_init(void)