Patch for cmd.c

[Andrew V. Samoilov]

Hi,
> 
> this patch fixes rare and almost impossible off-by-one.
> If user input is empty (""), these lines can do very bad thing:
> 
>     if (reg_exp_t [strlen(reg_exp_t) - 1] == PATH_SEP){
>         dirflag = 1;
>         reg_exp_t [strlen(reg_exp_t) - 1] = 0;
>     }
> 
> It is almoust impossible to meet PATH_SEP before '\0', but sometimes it happens.

Patch attached, sorry for inconvenience.

-- 
Regards,
Andrew V. Samoilov.
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