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880f7bc040
The `mp_event_wait_ms()` function may return earlier than the requested timeout, and if that happens repeatedly (eg due to lots of USB data and IRQs) then the loop waiting for CDC TX FIFO space to become available may exit much earlier than MICROPY_HW_USB_CDC_TX_TIMEOUT, even when there is no space. Fix this by using `mp_hal_ticks_ms()` to compute a more accurate timeout. The `basics/int_big_mul.py` test fails on RPI_PICO without this fix. Signed-off-by: Damien George <damien@micropython.org>