cdc: Fix autoflush for FIFO < MPS#1487
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sorry for late response, I was too busy with other works. The reason for change request: although it has more code, the additional condition CFG_TUD_CDC_TX_BUFSIZE < BULK_PACKET_SIZE is constant expression and will help the compiler to optimize it out.
Therefore we don't have to run tu_fifo_full() when bufsize is larger than the packet size (and const expression also not executed at all in other case)
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Describe the PR
If CDC TX buffer size is configured to be less than bulk packet size, the autoflushing condition is never reached.
Changes:
Additional context
Found out during espressif/esp-idf#9040