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f4d1bd0b76
A limit per connection is put on the number of buffers allocated by QUIC MUX for emission accross all its streams. This ensures memory consumption remains under control. This limit is simply explained as a count of buffers which can be concurrently allocated for each connection. As such, quic_conn structure was used to account currently allocated buffers. However, a quic_conn nevers allocates new stream buffers. This is only done at QUIC MUX layer. As such, this commit moves buffer accounting inside QCC structure. This simplifies the API, most notably qc_stream_buf_alloc() usage. Note that this commit inverts the accounting. Previously, it was initially set to 0 and increment for each allocated buffer. Now, it is set to the maximum value and decrement for each buf usage. This is considered as clearer to use.