stream: improve multiple callback error message
When a transform stream's callback is called more than once, an error is emitted with a somewhat confusing message. This commit hopes to improve the quality of the error message.
Fixes: https://github.com/nodejs/node/issues/12513
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
stream