CLEANUP: acl: remove unused assignment

Coverity found unused variable assignment

    CID 1299671 (#1 of 1): Unused value (UNUSED_VALUE)assigned_pointer:
    Assigning value from args[arg + 1] to word here, but that stored
    value is overwritten before it can be used.
 958                        word = args[arg + 1];
 959                        arg = arg_end;

src/acl.c

@@ -955,7 +955,6 @@ struct acl_cond *parse_acl_cond(const char **args, struct list *known_acl,
 				/* note that parse_acl() must have filled <err> here */
 				goto out_free_suite;
 			}
-			word = args[arg + 1];
 			arg = arg_end;
 		}
 		else {