[DCCP] ackvec: Remove unused dccpav_ack_ptr field from dccp_ackvec

Commiter note: original patch was splitted.
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

net/dccp/ackvec.c

@@ -141,7 +141,6 @@ struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
 		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_vec_len	= 0;

net/dccp/ackvec.h

@@ -41,7 +41,6 @@
  * Ack Vectors it has recently sent. For each packet sent carrying an
  * Ack Vector, it remembers four variables:
  *
- * @dccpav_ack_ptr - the value of buf_head at the time of acknowledgement.
  * @dccpav_records - list of dccp_ackvec_record
  * @dccpav_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
  *
@@ -53,7 +52,6 @@ struct dccp_ackvec {
 	struct list_head dccpav_records;
 	struct timeval	dccpav_time;
 	u8		dccpav_buf_head;
-	u8		dccpav_ack_ptr;
 	u8		dccpav_vec_len;
 	u8		dccpav_buf_nonce;
 	u8		dccpav_ack_nonce;