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http2: fix double free due to handling of rst_stream with cancel code

Rodrigo Muino Tomonari requested to merge github/fork/kumarak/kumarak/fix_38964 into master

The PR changes add the stream to the pending list on receiving RST_STREAM frame with error code nghttp2_cancel. This is to avoid the force purging of data on receiving the rst_stream frame.

On force purging, the nghttp2 raises close callback for already destroyed stream which is causing the double-free memory error.

Fixes: #38964

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