Move fixed value to struct initializer

contrib/pg_tde/src/catalog/tde_principal_key.c

@@ -79,6 +79,9 @@ static dshash_parameters principal_key_dsh_params = {
 	.entry_size = sizeof(TDEPrincipalKey),
 	.compare_function = dshash_memcmp,
 	.hash_function = dshash_memhash,
+#if PG_VERSION_NUM >= 170000
+	.copy_function = dshash_memcpy,
+#endif
 };
 
 static TdePrincipalKeylocalState principalKeyLocalState;
@@ -189,9 +192,6 @@ initialize_objects_in_dsa_area(dsa_area *dsa, void *raw_dsa_area)
 	sharedState->rawDsaArea = raw_dsa_area;
 	sharedState->hashTrancheId = LWLockNewTrancheId();
 	principal_key_dsh_params.tranche_id = sharedState->hashTrancheId;
-#if PG_VERSION_NUM >= 170000
-	principal_key_dsh_params.copy_function = dshash_memcpy;
-#endif
 	dsh = dshash_create(dsa, &principal_key_dsh_params, 0);
 	sharedState->hashHandle = dshash_get_hash_table_handle(dsh);
 	dshash_detach(dsh);