Repair MarlinSerial with TX-buffer
These '{' are important to avoid the redefinition of `unsigned char _sreg = SREG;` at the same level. Used in ``` #define CRITICAL_SECTION_START unsigned char _sreg = SREG; cli(); ```
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@ -244,10 +244,11 @@ void MarlinSerial::flush(void) {
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}
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tx_buffer.buffer[tx_buffer.head] = c;
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CRITICAL_SECTION_START;
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{ CRITICAL_SECTION_START;
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tx_buffer.head = i;
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SBI(M_UCSRxB, M_UDRIEx);
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CRITICAL_SECTION_END;
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}
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return;
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}
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