correct clock stretch timeout for board.I2C() #4390
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Fixes #4372.
The clock stretch timeout for
board.I2C()was given as zero, but the default is 255. This timeout is only used bybitbangio.I2C(), and didn't matter up to now for other ports. But the RP2040 port uses bitbangio for zero-byte writes, so it used the zero clock stretch timeout.Anyone can review. This is simple. Tested.