[Bug 243974] diff(1) generates core dump when --tabsize is used

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243974

--- Comment #1 from fehmi noyan isi <fnoyanisi at yahoo.com> ---
duplicate of 

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241714

The resolution mentioned in the above bug report is to pass the argument
following --tabsize after an equal sign, e,g, --tabsize=NUMBER as opposed to
--tabsize NUMBER.

In diff.c, the argument to tabsize is classified as "optional_argument" whereas
it should be "required_argument". 

We either should;
- update the man page and indicate the argument following --tabsize is optional
- make the argument to --tabsize required. 

I am more keen to go with the second option (i.e. making the argument mandatory
for the --tabsize). It does not make much sense to use only --tabsize

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