fix compiler warning

ldap/servers/plugins/acl/aclutil.c

@@ -1400,7 +1400,6 @@ void acl_ht_add_and_freeOld(acl_ht_t * acl_ht,
 void acl_ht_remove_and_free(acl_ht_t * acl_ht,
 					PLHashNumber key){
 	char *old_value = NULL;	
-	uintptr_t pkey = (uintptr_t)key;
 
 	if ( (old_value = (char *)acl_ht_lookup( acl_ht, key)) != NULL ) {
 		acl_ht_remove( acl_ht, key);