dgram: socket.send without address fails with weird error on 5.7

[mafintosh]

On node 4.x and node <5.7 this worked

var dgram = require('dgram')
var socket = dgram.createSocket('udp4')

socket.send(Buffer('hi'), 0, 2, 10000) // works on 4.x <5.7

With node 5.7 this fails with

RangeError: Port should be > 0 and < 65536

The dgram docs on both 4.x and 5.x say

 If the address is not specified or is an empty string, '0.0.0.0' or '::0' will be used instead

• Version: v5.7.0
• Platform: Darwin brunhilde.local 15.2.0 Darwin Kernel Version 15.2.0: Fri Nov 13 19:56:56 PST 2015; root:xnu-3248.20.55~2/RELEASE_X86_64 x86_64

[Fishrock123]

cc @mcollina

[mcollina]

Yes it was me. Here is the infringing lines: https://github.com/nodejs/node/blob/master/lib/dgram.js#L298-L299.
I will send a PR tomorrow and I will add a unit test, so we avoid further regression on this area.

Thanks @Fishrock123 for routing this.

[reqshark]

good catch @mafintosh