Make some 64 bit warnings go away on x86-64.

networking/ping6.c

@@ -311,7 +311,7 @@ static void unpack(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit
 			return;
 
 		printf("%d bytes from %s: icmp6_seq=%u", sz,
-			   inet_ntop(AF_INET6, (struct in_addr6 *) &pingaddr.sin6_addr,
+			   inet_ntop(AF_INET6, &pingaddr.sin6_addr,
 						 buf, sizeof(buf)),
 			   icmppkt->icmp6_seq);
 		printf(" ttl=%d time=%lu.%lu ms", hoplimit,
@@ -392,7 +392,7 @@ static void ping(const char *host)
 
 	printf("PING %s (%s): %d data bytes\n",
 	           hostent->h_name,
-			   inet_ntop(AF_INET6, (struct in_addr6 *) &pingaddr.sin6_addr,
+			   inet_ntop(AF_INET6, &pingaddr.sin6_addr,
 						 buf, sizeof(buf)),
 		   datalen);