fix(uart): prevent deinitializing another UART #2754
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If called from an uninitialized HardwareSerial, the code unintentionally deinit the UART at uart_handlers[0] Signed-off-by: Thiago Henrique Alves <35922412+thiagogba@users.noreply.github.com>
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If called from an uninitialized HardwareSerial, the code unintentionally deinit the UART at uart_handlers[0]