BUG/MINOR: mux_quic: prevent multiple STOP_SENDING emission per stream
A QUIC stream may be aborted to ignore future data read. This also
prepares a STOP_SENDING frame to instruct the peer to close its write
channel.
This capability is exposed via qcc_abort_stream_read() which should be
guarded against multiple invokation for a single stream. This was
checked via QC_SF_TO_STOP_SENDING flag. However, this flag is resetted
once STOP_SENDING frame is emitted. Thus in theory it could be possible
to emit several STOP_SENDING for a single stream.
This patch improves this by using QC_SF_READ_ABORTED flag check. This
flag is set during qcc_abort_stream_read() and never removed even after
STOP_SENDING frame is emitted.
This bug was never encountered in a real situation. However, this patch
is necessary to definitely guarantee that it cannot occur.
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