aa_unpack_blob
size_t aa_unpack_blob(struct aa_ext *e, char **blob, const char *name);
data->size = aa_unpack_blob(e, &data->data, NULL);
EXPORT_SYMBOL_IF_KUNIT(aa_unpack_blob);
size = aa_unpack_blob(e, &blob, "aadfa");
size = aa_unpack_blob(puf->e, &blob, NULL);
size = aa_unpack_blob(puf->e, &blob, TEST_BLOB_NAME);
size = aa_unpack_blob(puf->e, &blob, TEST_BLOB_NAME);