security/keys/trusted-keys/trusted_dcp.c:206:24: sparse: sparse: incorrect type in assignment (different base types)

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6d69b6c12fce479fde7bc06f686212451688a102
commit: 2e8a0f40a39cc253002f21c54e1b5b995e5ec510 KEYS: trusted: Introduce NXP DCP-backed trusted keys
date:   2 weeks ago
config: arm-randconfig-r112-20240524 (https://download.01.org/0day-ci/archive/20240524/202405240610.fj53EK0q-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240524/202405240610.fj53EK0q-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/202405240610.fj53EK0q-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> security/keys/trusted-keys/trusted_dcp.c:206:24: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted __le32 [usertype] payload_len @@     got unsigned int @@
   security/keys/trusted-keys/trusted_dcp.c:206:24: sparse:     expected restricted __le32 [usertype] payload_len
   security/keys/trusted-keys/trusted_dcp.c:206:24: sparse:     got unsigned int

vim +206 security/keys/trusted-keys/trusted_dcp.c

   179	
   180	static int trusted_dcp_seal(struct trusted_key_payload *p, char *datablob)
   181	{
   182		struct dcp_blob_fmt *b = (struct dcp_blob_fmt *)p->blob;
   183		int blen, ret;
   184	
   185		blen = calc_blob_len(p->key_len);
   186		if (blen > MAX_BLOB_SIZE)
   187			return -E2BIG;
   188	
   189		b->fmt_version = DCP_BLOB_VERSION;
   190		get_random_bytes(b->nonce, AES_KEYSIZE_128);
   191		get_random_bytes(b->blob_key, AES_KEYSIZE_128);
   192	
   193		ret = do_aead_crypto(p->key, b->payload, p->key_len, b->blob_key,
   194				     b->nonce, true);
   195		if (ret) {
   196			pr_err("Unable to encrypt blob payload: %i\n", ret);
   197			return ret;
   198		}
   199	
   200		ret = encrypt_blob_key(b->blob_key);
   201		if (ret) {
   202			pr_err("Unable to encrypt blob key: %i\n", ret);
   203			return ret;
   204		}
   205	
 > 206		b->payload_len = get_unaligned_le32(&p->key_len);
   207		p->blob_len = blen;
   208		return 0;
   209	}
   210	

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