ASoC: Intel: sof_sdw: fix signed/unsigned warning

Sparse throws the following warning:

sound/soc/intel/boards/sof_sdw.c:796:31: error: incorrect type in argument 6 (different signedness)
sound/soc/intel/boards/sof_sdw.c:796:31:    expected int *group_id
sound/soc/intel/boards/sof_sdw.c:796:31:    got unsigned int *

The group_id cannot be negative, use unsigned int.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Paul Olaru <paul.olaru@oss.nxp.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20210621194057.21711-8-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw.c

@@ -682,7 +682,7 @@ static int set_codec_init_func(const struct snd_soc_acpi_link_adr *link,
  */
 static int get_slave_info(const struct snd_soc_acpi_link_adr *adr_link,
 			  struct device *dev, int *cpu_dai_id, int *cpu_dai_num,
-			  int *codec_num, int *group_id,
+			  int *codec_num, unsigned int *group_id,
 			  bool *group_generated)
 {
 	const struct snd_soc_acpi_adr_device *adr_d;