[PATCH v3] ASoC: ti: omap-mcbsp: duplicate sysfs error

[Mark Brown]

On Thu, Jun 16, 2022 at 03:26:45PM -0500, David Owens wrote:
> Convert to managed versions of sysfs and clk allocation to simplify
> unbinding and error handling in probe.  Managed sysfs node
> creation specifically addresses the following error seen the second time
> probe is attempted after sdma_pcm_platform_register() previously requested
> probe deferral:

This breaks an x86 allmodconfig build:

In file included from /build/stage/linux/include/linux/kobject.h:20,
                 from /build/stage/linux/include/linux/module.h:21,
                 from /build/stage/linux/sound/soc/ti/omap-mcbsp.c:12:
/build/stage/linux/sound/soc/ti/omap-mcbsp.c:604:18: error: ‘additional_groups’ defined but not used [-Werror=unused-variable]
  604 | ATTRIBUTE_GROUPS(additional);
      |                  ^~~~~~~~~~
/build/stage/linux/include/linux/sysfs.h:154:38: note: in definition of macro ‘__ATTRIBUTE_GROUPS’
  154 | static const struct attribute_group *_name##_groups[] = {       \
      |                                      ^~~~~
/build/stage/linux/sound/soc/ti/omap-mcbsp.c:604:1: note: in expansion of macro ‘ATTRIBUTE_GROUPS’
  604 | ATTRIBUTE_GROUPS(additional);
      | ^~~~~~~~~~~~~~~~
In file included from /build/stage/linux/include/linux/kobject.h:20,
                 from /build/stage/linux/include/linux/module.h:21,
                 from /build/stage/linux/sound/soc/ti/omap-mcbsp-st.c:12:
/build/stage/linux/sound/soc/ti/omap-mcbsp-st.c:299:18: error: ‘sidetone_groups’ defined but not used [-Werror=unused-variable]
  299 | ATTRIBUTE_GROUPS(sidetone);
      |                  ^~~~~~~~
/build/stage/linux/include/linux/sysfs.h:154:38: note: in definition of macro ‘__ATTRIBUTE_GROUPS’
  154 | static const struct attribute_group *_name##_groups[] = {       \
      |                                      ^~~~~
/build/stage/linux/sound/soc/ti/omap-mcbsp-st.c:299:1: note: in expansion of macro ‘ATTRIBUTE_GROUPS’
  299 | ATTRIBUTE_GROUPS(sidetone);
      | ^~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
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