Back out r186615; the sanitizing of the pointers in the error case

is not needed and seems that it will not be needed either.

Pointy hat:	mine, mine, mine and not pho's

sys/kern/kern_jail.c

@@ -329,11 +329,9 @@ jail_copyin_ips(struct jail *j)
 e_free_ip:
 #ifdef INET6
 	free(ip6, M_PRISON);
-	j->ip6 = NULL;
 #endif
 #ifdef INET
 	free(ip4, M_PRISON);
-	j->ip4 = NULL;
 #endif
 	return (error);
 }