Description:
------------
When executing the script below an error occurs.
A trace with strace show that the struct sockaddr of the system call sendto is uninitialized (or badly initialized) :

sendto(3, "Test Message", 12, 0, {sa_family=0x45a0 /* AF_??? */, sa_data="<\10\20\0\0\0\20\0\0\0\250\376\343\277"}, 16) = -1 EINVAL (Invalid argument)


Reproduce code:
---------------
<?
$sh = socket_create(AF_INET6,SOCK_DGRAM,0);
if (socket_bind($sh, '::1', 4242)) {
    echo "Socket ok\n";
}
$buf = 'Test Message';
$len = strlen($buf);
if (socket_sendto($sh, $buf, $len, 0x00, '::1', 4000) !== FALSE) {
    echo "Message sent\n";
}
socket_close($sh);
?>


Expected result:
----------------
an IPv6 UDP datagram should be sent to the IPv6 loopback address.

Actual result:
--------------
Warning: socket_sendto(): unable to write to socket [22]: Invalid argument in /tmp/toto.php on line 12