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Fix hang in Serial.flush() #1164

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_state will be 0x2 for half-duplex mode, so we need to be careful with operator precedence to test only the low bit. Without this change, Serial.flush() hangs when half-duplex is enabled and no data has yet been sent.

_state will be 0x2 for half-duplex mode, so we need to be careful with
operator precedence to test only the low bit. Without this change,
Serial.flush() hangs when half-duplex is enabled and no data has yet
been sent.
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