serial: fix parity for inverse coding convention Important note: it is my (Mother Mychaela's) understanding that SIM cards with inverse coding convention are extremely rare, and I have never seen such a card. Therefore, our support for the inverse coding convention will likely remain forever untested.

struct cmdtab {
	char *cmd;
	int minargs;
	int maxargs;
	int allow_redir;
	int (*func)();
};