[PATCH 22/22] drm: ensure drm headers are self-contained and pass kernel-doc

[kernel test robot]

Hi Jani,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[cannot apply to drm/drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes linus/master v6.8-rc7 next-20240306]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jani-Nikula/drm-crtc-make-drm_crtc_internal-h-self-contained/20240307-023603
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/e22ab28836ee1689ea4781ed53fd2e4e4f84728e.1709749576.git.jani.nikula%40intel.com
patch subject: [PATCH 22/22] drm: ensure drm headers are self-contained and pass kernel-doc
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20240307/202403071204.gJtMneoq-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240307/202403071204.gJtMneoq-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403071204.gJtMneoq-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   drivers/gpu/drm/./drm_crtc_internal.h: In function 'drm_edid_load_firmware':
>> drivers/gpu/drm/./drm_crtc_internal.h:304:16: error: implicit declaration of function 'ERR_PTR' [-Werror=implicit-function-declaration]
     304 |         return ERR_PTR(-ENOENT);
         |                ^~~~~~~
>> drivers/gpu/drm/./drm_crtc_internal.h:304:25: error: 'ENOENT' undeclared (first use in this function)
     304 |         return ERR_PTR(-ENOENT);
         |                         ^~~~~~
   drivers/gpu/drm/./drm_crtc_internal.h:304:25: note: each undeclared identifier is reported only once for each function it appears in
   In file included from <command-line>:
   drivers/gpu/drm/./drm_crtc_internal.h: At top level:
>> drivers/gpu/drm/./drm_crtc_internal.h:302:1: error: redefinition of 'drm_edid_load_firmware'
     302 | drm_edid_load_firmware(struct drm_connector *connector)
         | ^~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/./drm_crtc_internal.h:302:1: note: previous definition of 'drm_edid_load_firmware' with type 'const struct drm_edid *(struct drm_connector *)'
     302 | drm_edid_load_firmware(struct drm_connector *connector)
         | ^~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/./drm_crtc_internal.h: In function 'drm_edid_load_firmware':
>> drivers/gpu/drm/./drm_crtc_internal.h:304:25: error: 'ENOENT' undeclared (first use in this function)
     304 |         return ERR_PTR(-ENOENT);
         |                         ^~~~~~
   cc1: all warnings being treated as errors


vim +/ERR_PTR +304 drivers/gpu/drm/./drm_crtc_internal.h

5f2d0ed49036a0 Jani Nikula 2022-10-24  296  
5f2d0ed49036a0 Jani Nikula 2022-10-24  297  /* drm_edid_load.c */
5f2d0ed49036a0 Jani Nikula 2022-10-24  298  #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
5f2d0ed49036a0 Jani Nikula 2022-10-24  299  const struct drm_edid *drm_edid_load_firmware(struct drm_connector *connector);
5f2d0ed49036a0 Jani Nikula 2022-10-24  300  #else
5f2d0ed49036a0 Jani Nikula 2022-10-24  301  static inline const struct drm_edid *
5f2d0ed49036a0 Jani Nikula 2022-10-24 @302  drm_edid_load_firmware(struct drm_connector *connector)
5f2d0ed49036a0 Jani Nikula 2022-10-24  303  {
5f2d0ed49036a0 Jani Nikula 2022-10-24 @304  	return ERR_PTR(-ENOENT);

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