CCS/MSP430F5529: MSP430 : problem with Poll for transmit interrupt flag condition

bool USCI_B_I2C_masterSendSingleByteWithTimeout(uint16_t baseAddress,
                                                uint8_t txData,
                                                uint32_t timeout)
{
    // Creating variable for second timeout scenario
    uint32_t timeout2 = timeout;

    //Store current TXIE status
    uint8_t txieStatus = HWREG8(baseAddress + OFS_UCBxIE) & UCTXIE;

    //Disable transmit interrupt enable
    HWREG8(baseAddress + OFS_UCBxIE) &= ~(UCTXIE);

    //Send start condition.
    HWREG8(baseAddress + OFS_UCBxCTL1) |= UCTR + UCTXSTT;

    //Poll for transmit interrupt flag.
    while((!(HWREG8(baseAddress + OFS_UCBxIFG) & UCTXIFG)) && --timeout)
    {
        ;
    }

    //Check if transfer timed out
    if(timeout == 0)
    {
        return (STATUS_FAIL);
    }

    //Send single byte data.
    HWREG8(baseAddress + OFS_UCBxTXBUF) = txData;

    //Poll for transmit interrupt flag.
    while((!(HWREG8(baseAddress + OFS_UCBxIFG) & UCTXIFG)) && --timeout2)  // ======> code block here 
    {
        ;
    }

    //Check if transfer timed out
    if(timeout2 == 0)
    {
        return (STATUS_FAIL);
    }

    //Send stop condition.
    HWREG8(baseAddress + OFS_UCBxCTL1) |= UCTXSTP;

    //Clear transmit interrupt flag before enabling interrupt again
    HWREG8(baseAddress + OFS_UCBxIFG) &= ~(UCTXIFG);

    //Reinstate transmit interrupt enable
    HWREG8(baseAddress + OFS_UCBxIE) |= txieStatus;

    return (STATUS_SUCCESS);

}

void USCI_B_I2C_masterSendMultiByteStart(uint16_t baseAddress,
                                         uint8_t txData)
{
    //Store current transmit interrupt enable
    uint8_t txieStatus = HWREG8(baseAddress + OFS_UCBxIE) & UCTXIE;

    //Disable transmit interrupt enable
    HWREG8(baseAddress + OFS_UCBxIE) &= ~(UCTXIE);

    //Send start condition.
    HWREG8(baseAddress + OFS_UCBxCTL1) |= UCTR + UCTXSTT;

    //Poll for transmit interrupt flag.
    while(!(HWREG8(baseAddress + OFS_UCBxIFG) & UCTXIFG))
    {
        ;
    }

    //Send single byte data.
    HWREG8(baseAddress + OFS_UCBxTXBUF) = txData;

    //Reinstate transmit interrupt enable
    HWREG8(baseAddress + OFS_UCBxIE) |= txieStatus;
}

 P4REN |= 0x06;