[IPV6] NDISC: Fix setting base_reachable_time_ms variable.

This bug was introduced by the commit
d12af679 (sysctl: fix neighbour table
sysctls).
Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ndisc.c

@@ -1670,7 +1670,7 @@ int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * f
 					    filp, buffer, lenp, ppos);
 
 	else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
-		 (strcmp(ctl->procname, "base_reacable_time_ms") == 0))
+		 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
 		ret = proc_dointvec_ms_jiffies(ctl, write,
 					       filp, buffer, lenp, ppos);
 	else