UPSTREAM: ASoC: hdmi-codec: remove useless initialization

Fix cppcheck warning:

sound/soc/codecs/hdmi-codec.c:745:5: style: Redundant initialization
for 'cf'. The initialized value is overwritten before it is
read. [redundantInitialization]
 cf = dai->playback_dma_data;
    ^
sound/soc/codecs/hdmi-codec.c:738:31: note: cf is initialized
 struct hdmi_codec_daifmt *cf = dai->playback_dma_data;
                              ^
sound/soc/codecs/hdmi-codec.c:745:5: note: cf is overwritten
 cf = dai->playback_dma_data;
    ^

Bug: 239396464
Change-Id: Ia903635862e043207929827afcaeb531e6344283
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210312182246.5153-11-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
(cherry picked from commit 3c011ef3)