bug#29842: 27.0; `dired-change-marks': args should not be optional

[Tino Calancha]

Drew Adams <drew.adams@oracle.com> writes:

> 1. There is no use of this function in the Emacs Lisp sources that needs
>    to have the args be optional.
Yes, it has sense that the arguments be mandatory.

> 2. If (dired-change-marks) is evaluated then you get an error:
>
>    Debugger entered--Lisp error: (error "Format specifier doesn't match
>                                          argument type") 
>     format("\n%c" "nil")
>     dired-change-marks()
>     eval((dired-change-marks))
Then the programmer would get the more intuitive
'Wrong number of arguments' error.