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Handers of a specific form are both designed to be used as callbacks for param(), and also dispose of the command if something goes wrong. Make them return the 'struct command_result *' from command_failed(), or NULL. Renaming them just makes sense: json_tok_XXX is used for non-command-freeing parsers too. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>