ASoC: SOF: Intel: Initialize chip in hda_sdw_check_wakeen_irq()

ASoC: SOF: Intel: Initialize chip in hda_sdw_check_wakeen_irq()

Clang warns (or errors with CONFIG_WERROR):

  sound/soc/sof/intel/hda.c:423:6: error: variable 'chip' is uninitialized when used here [-Werror,-Wuninitialized]
    423 |         if (chip && chip->check_sdw_wakeen_irq)
        |             ^~~~
  sound/soc/sof/intel/hda.c:418:39: note: initialize the variable 'chip' to silence this warning
    418 |         const struct sof_intel_dsp_desc *chip;
        |                                              ^
        |                                               = NULL
  1 error generated.

Add the missing initialization, following the pattern of the other irq
functions.

Fixes: 9362ab78f175 ("ASoC: SOF: Intel: add abstraction for SoundWire wake-ups")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230809-intel-hda-missing-chip-init-v1-1-61557ca6fa8a@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>