[IPV4]: Apply sysctl_icmp_echo_ignore_broadcasts to ICMP_TIMESTAMP as well.

This was the full intention of the original code.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/icmp.c

@@ -970,7 +970,8 @@ int icmp_rcv(struct sk_buff *skb)
 		 *	RFC 1122: 3.2.2.8 An ICMP_TIMESTAMP MAY be silently
 		 *	  discarded if to broadcast/multicast.
 		 */
-		if (icmph->type == ICMP_ECHO &&
+		if ((icmph->type == ICMP_ECHO ||
+		     icmph->type == ICMP_TIMESTAMP) &&
 		    sysctl_icmp_echo_ignore_broadcasts) {
 			goto error;
 		}