[TCP]: Only non-zero inits are necessary in tcp_vX_init_sock.

net/ipv4/tcp_ipv4.c

@@ -2032,9 +2032,6 @@ static int tcp_v4_init_sock(struct sock *sk)
 	 */
 	tp->snd_cwnd = 2;
 
-	tp->frto_counter = 0;
-	tp->frto_highmark = 0;
-
 	/* See draft-stevens-tcpca-spec-01 for discussion of the
 	 * initialization of these values.
 	 */

net/ipv6/tcp_ipv6.c

@@ -1849,9 +1849,6 @@ static int tcp_v6_init_sock(struct sock *sk)
 	 */
 	tp->snd_cwnd = 2;
 
-	tp->frto_counter = 0;
-	tp->frto_highmark = 0;
-
 	/* See draft-stevens-tcpca-spec-01 for discussion of the
 	 * initialization of these values.
 	 */