net: kill unused macros from head file

These macros have been defined for several years since v2.6.12-rc2（tracing by git）,
but never be used. So remove them.
Signed-off-by: NShan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/addrconf.h

 #ifndef _ADDRCONF_H
 #define _ADDRCONF_H
 
-#define RETRANS_TIMER	HZ
-
 #define MAX_RTR_SOLICITATIONS		3
 #define RTR_SOLICITATION_INTERVAL	(4*HZ)
 

include/net/ip6_route.h

@@ -3,7 +3,6 @@
 
 #define IP6_RT_PRIO_USER	1024
 #define IP6_RT_PRIO_ADDRCONF	256
-#define IP6_RT_PRIO_KERN	512
 
 struct route_info {
 	__u8			type;

include/net/ndisc.h

@@ -42,9 +42,6 @@ enum {
 #define ND_REACHABLE_TIME		(30*HZ)
 #define ND_RETRANS_TIMER		HZ
 
-#define ND_MIN_RANDOM_FACTOR		(1/2)
-#define ND_MAX_RANDOM_FACTOR		(3/2)
-
 #ifdef __KERNEL__
 
 #include <linux/compiler.h>

include/net/snmp.h

@@ -60,7 +60,6 @@ struct ipstats_mib {
 };
 
 /* ICMP */
-#define ICMP_MIB_DUMMY	__ICMP_MIB_MAX
 #define ICMP_MIB_MAX	__ICMP_MIB_MAX
 struct icmp_mib {
 	unsigned long	mibs[ICMP_MIB_MAX];

include/net/sock.h

@@ -516,9 +516,6 @@ static __inline__ void sk_add_bind_node(struct sock *sk,
 #define sk_nulls_for_each_from(__sk, node) \
 	if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
 		hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
-#define sk_for_each_continue(__sk, node) \
-	if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
-		hlist_for_each_entry_continue(__sk, node, sk_node)
 #define sk_for_each_safe(__sk, node, tmp, list) \
 	hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
 #define sk_for_each_bound(__sk, node, list) \

include/net/tcp.h

@@ -100,12 +100,6 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
 #define TCP_SYNACK_RETRIES 5	/* number of times to retry passive opening a
 				 * connection: ~180sec is RFC minimum	*/
 
-
-#define TCP_ORPHAN_RETRIES 7	/* number of times to retry on an orphaned
-				 * socket. 7 is ~50sec-16min.
-				 */
-
-
 #define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to destroy TIME-WAIT
 				  * state, about 60 seconds	*/
 #define TCP_FIN_TIMEOUT	TCP_TIMEWAIT_LEN