[whatwg/streams] ShouldCallPull: Assert desiredSize is not null (#926)

ReadableStreamDefaultControllerShouldCallPull implicitly assumes that
desiredSize is not null when it compares it to 0. This is guaranteed by
the check of
ReadableStreamDefaultControllerCanCloseOrEnqueue(controller), but it's
not obvious. Add an assert to make it explicit.

Also do the same for ReadableByteStreamControllerShouldCallPull.

No functional changes.

Closes #919.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/926

-- Commit Summary --

  * ShouldCallPull: Assert desiredSize is not null

-- File Changes --

    M index.bs (5)
    M reference-implementation/lib/readable-stream.js (5)

-- Patch Links --

https://github.com/whatwg/streams/pull/926.patch
https://github.com/whatwg/streams/pull/926.diff

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