[whatwg/fetch] aborting locked request body (#1286)

In https://fetch.spec.whatwg.org/#abort-fetch it says:

> If request’s body is not null and is readable, then cancel request’s body with error.

However, there is no check for whether the body is "locked" which means that "cancel" can throw, which doesn't seem to be taken into account here (only whether or not the stream is readable).

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