`bjoentegaard` freezing if invalid parameters has been supplied

[eirnym]

Hi,

bjoentegaard app freezez if invalid parameters has been supplied.

getopt documetation states following

     The getopt() function returns the next known option character in optstring.  If getopt() encounters a character not found in optstring or if it detects a
     missing option argument, it returns ‘?’ (question mark).  If optstring has a leading ‘:’ then a missing option argument causes ‘:’ to be returned instead of
     ‘?’.  In either case, the variable optopt is set to the character that caused the error.  The getopt() function returns -1 when the argument list is
     exhausted.

This means that application won't know that parameters were invalid.

I suspect, that other applications in this repository should be audited as well.