http2: fix memory leak when headers are not emitted
When headers are not emitted to JS, e.g. because of an error before that could happen, we currently still have the vector of previously received headers lying around, each one holding a reference count of 1.
To fix the resulting memory leak, release them in the Http2Stream
destructor.
Also, clear the vector of headers once they have been emitted – there’s not need to keep it around, wasting memory.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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