[whatwg/streams] Tighten the assertion on the owner stream in ReadableStreamReaderGene… (#472)

…ricRelease()

We can expect reader@[[ownerReadableStream]]@[[reader]] to be reader than
just non-undefined-ness.

Fixes: #466
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/472

-- Commit Summary --

  * Tighten the assertion on the owner stream in ReadableStreamReaderGenericRelease()

-- File Changes --

    M index.bs (2)
    M reference-implementation/lib/readable-stream.js (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/472.patch
https://github.com/whatwg/streams/pull/472.diff

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