netfilter: delete repeated words

Drop duplicated words in net/netfilter/ and net/ipv4/netfilter/.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/ipv4/netfilter/nf_nat_pptp.c

@@ -3,7 +3,7 @@
  * nf_nat_pptp.c
  *
  * NAT support for PPTP (Point to Point Tunneling Protocol).
- * PPTP is a a protocol for creating virtual private networks.
+ * PPTP is a protocol for creating virtual private networks.
  * It is a specification defined by Microsoft and some vendors
  * working with Microsoft.  PPTP is built on top of a modified
  * version of the Internet Generic Routing Encapsulation Protocol.

net/netfilter/nf_conntrack_pptp.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Connection tracking support for PPTP (Point to Point Tunneling Protocol).
- * PPTP is a a protocol for creating virtual private networks.
+ * PPTP is a protocol for creating virtual private networks.
  * It is a specification defined by Microsoft and some vendors
  * working with Microsoft.  PPTP is built on top of a modified
  * version of the Internet Generic Routing Encapsulation Protocol.

net/netfilter/nf_conntrack_proto_tcp.c

@@ -1152,7 +1152,7 @@ int nf_conntrack_tcp_packet(struct nf_conn *ct,
 		   && (old_state == TCP_CONNTRACK_SYN_RECV
 		       || old_state == TCP_CONNTRACK_ESTABLISHED)
 		   && new_state == TCP_CONNTRACK_ESTABLISHED) {
-		/* Set ASSURED if we see see valid ack in ESTABLISHED
+		/* Set ASSURED if we see valid ack in ESTABLISHED
 		   after SYN_RECV or a valid answer for a picked up
 		   connection. */
 		set_bit(IPS_ASSURED_BIT, &ct->status);

net/netfilter/xt_recent.c

@@ -640,7 +640,7 @@ static void __net_exit recent_proc_net_exit(struct net *net)
 	struct recent_table *t;
 
 	/* recent_net_exit() is called before recent_mt_destroy(). Make sure
-	 * that the parent xt_recent proc entry is is empty before trying to
+	 * that the parent xt_recent proc entry is empty before trying to
 	 * remove it.
 	 */
 	spin_lock_bh(&recent_lock);