ff7925dce0
Similarly to the H1 multiplexer, H2_CF_ERR_PENDING is now used to report an error when we try to send data and H2_CF_ERROR to report an error when we try to read data. In other funcions, we rely on these flags instead of connection ones. Only H2_CF_ERROR is considered as a final error. H2_CF_ERR_PENDING does not block receive attempt. In addition, we rely on H2_CF_RCVD_SHUT flag to test if a read0 was received or not.