cmd: fix arglist count not including multiple occurrences of the same non-arg options

cmd/arglist.c

@@ -921,6 +921,10 @@ bool b_arglist_iterator_next(struct b_arglist_iterator *it)
 		}
 
 		b_btree_iterator_begin(&opt->opt_values, &it->_arg_it);
+
+		if (it->_arg_filter == B_COMMAND_INVALID_ID) {
+			return true;
+		}
 	}
 }