coverity/105985: Resource leak: RI.

Problem    : Resource leak @ 94, 98, 102.
Diagnostic : Real issue.
Rationale  : Coverity doesn't know that uv_pipe_open will save file
             descriptor to close them later. So, it signals file
             descriptors being leaked. This would then seem like a false
             positive we can fix by teaching coverity about uv_pipe_open
             through model file.
             But then we realize that the above is only true if
             uv_pipe_open succeeds. It it fails, then descriptors are
             really being leaked, which is why this is considered a real
             issue and not a false positive after all.
Resolution : Add error handling to correctly close descriptors if
             uv_pipe_open fails at any point.
             Add model for uv_pipe_open so that Coverity knows it will
             save descriptors when no error.

Helped-by: oni-link <knil.ino@gmail.com>

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