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drivers/serial/serial: typo fix in comment
Signed-off-by: Kerogit <kr.git@kerogit.eu>
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@@ -513,7 +513,7 @@ static int uart_tcdrain(FAR uart_dev_t *dev,
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#endif
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}
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/* Get exclusive access to the to dev->tmit. We cannot permit new data to
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/* Get exclusive access to the to dev->xmit. We cannot permit new data to
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* be written while we are trying to flush the old data.
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*
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* A signal received while waiting for access to the xmit.head will abort
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