DACSLOPE bit of Register 06h ADC and DAC Control 2:
        0: Normal mode
        1: Sloping stop-band mode
Thus in the case of normal mode, we should clear DACSLOPE bit.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org
        if (fs <= 24000)
                reg |= WM8961_DACSLOPE;
        else
-               reg &= WM8961_DACSLOPE;
+               reg &= ~WM8961_DACSLOPE;
        snd_soc_write(codec, WM8961_ADC_DAC_CONTROL_2, reg);
 
        return 0;