Convert more programs to the new option and verb parsers (#41458)

src/shared/parse-argument.c

@@ -130,11 +130,7 @@ int parse_signal_argument(const char *s, int *ret) {
                                 return table_log_add_error(r);
                 }
 
-                r = table_print(table, NULL);
-                if (r < 0)
-                        return table_log_print_error(r);
-
-                return 0;
+                return table_print_or_warn(table);
         }
 
         r = signal_from_string(s);