firmware: cs_dsp: Perform NULL check in cs_dsp_coeff_write/read_ctrl
Add a NULL check to the cs_dsp_coeff_write/read_ctrl functions. This is a major convenience for users of the cs_dsp library as it allows the call to cs_dsp_get_ctl to be inlined with the call to read/write the control itself. Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20211117132300.1290-7-ckeepax@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>
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