hostaudio_kern.c:undefined reference to `unregister_sound_mixer'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4b810bf037e524b54669acbe4e0df54b15d87ea1
commit: 8c6174503c7b7134c22072b45f92724c8a959f06 um: hostfs: define our own API boundary
date:   3 months ago
config: um-randconfig-r015-20230714 (https://download.01.org/0day-ci/archive/20230714/202307141416.vxuRVpFv-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230714/202307141416.vxuRVpFv-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307141416.vxuRVpFv-lkp@intel.com/

All errors (new ones prefixed by >>):

   /usr/bin/ld: arch/um/drivers/hostaudio_kern.o: in function `hostaudio_cleanup_module':
>> hostaudio_kern.c:(.exit.text+0xa): undefined reference to `unregister_sound_mixer'
>> /usr/bin/ld: hostaudio_kern.c:(.exit.text+0x15): undefined reference to `unregister_sound_dsp'
   /usr/bin/ld: arch/um/drivers/hostaudio_kern.o: in function `hostaudio_init_module':
>> hostaudio_kern.c:(.init.text+0x19): undefined reference to `register_sound_dsp'
>> /usr/bin/ld: hostaudio_kern.c:(.init.text+0x31): undefined reference to `register_sound_mixer'
>> /usr/bin/ld: hostaudio_kern.c:(.init.text+0x49): undefined reference to `unregister_sound_dsp'
   collect2: error: ld returned 1 exit status

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