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child_process: fix handleless NODE_HANDLE handling

Rodrigo Muino Tomonari requested to merge github/fork/santigimeno/cluster_fix into master

It can happen that recvmsg() may return an error on ancillary data reception when receiving a NODE_HANDLE message (for example MSG_CTRUNC). This would end up, if the handle type was net.Socket, on a message event with a non null but invalid sendHandle. Avoid this by checking the handle validity before performing the handleConversion.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

child_process

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