[SCTP]: Kill unused static inline sctp_sysctl_jiffies_ms

After the patch:
$ git-grep sctp_sysctl_jiffies_ms | wc -l
0
Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Acked-by: NVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/sctp/sctp.h

@@ -368,11 +368,6 @@ void sctp_sysctl_unregister(void);
 #else
 static inline void sctp_sysctl_register(void) { return; }
 static inline void sctp_sysctl_unregister(void) { return; }
-static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
-		void __user *oldval, size_t __user *oldlenp,
-		void __user *newval, size_t newlen) {
-	return -ENOSYS;
-}
 #endif
 
 /* Size of Supported Address Parameter for 'x' address types. */