Fix crash on error when using stream

[kriscarle]

The output stream was not closed after emitting the error. This was causing the main Node thread to crash with a segmentation fault, maybe when then spawn is cleaned up while still being attached to the open stream. This should fix #46 too

Happening for me on Node v10 and v12, possibly older versions are okay?

From the docs

The stream is not closed when the 'error' event is emitted unless the autoDestroy option was set to true when creating the stream.

After 'error', no further events other than 'close' should be emitted (including 'error' events).

https://nodejs.org/api/stream.html#stream_event_error

[wavded]

Thanks @kriscarle !