[PATCH v13 bpf-next 6/6] selftests/bpf: Add test that uses fsverity and xattr to sign a file

[kernel test robot]

Hi Song,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Song-Liu/bpf-Add-kfunc-bpf_get_file_xattr/20231124-074239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20231123233936.3079687-7-song%40kernel.org
patch subject: [PATCH v13 bpf-next 6/6] selftests/bpf: Add test that uses fsverity and xattr to sign a file
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231125/202311250314.KGxKh0fm-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/202311250314.KGxKh0fm-lkp@intel.com/

All errors (new ones prefixed by >>):

>> progs/test_sig_in_xattr.c:36:26: error: invalid application of 'sizeof' to an incomplete type 'struct fsverity_digest'
      36 | char digest[MAGIC_SIZE + sizeof(struct fsverity_digest) + SHA256_DIGEST_SIZE];
         |                          ^     ~~~~~~~~~~~~~~~~~~~~~~~~
   progs/test_sig_in_xattr.c:36:40: note: forward declaration of 'struct fsverity_digest'
      36 | char digest[MAGIC_SIZE + sizeof(struct fsverity_digest) + SHA256_DIGEST_SIZE];
         |                                        ^
   1 error generated.

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