[Kst] [Bug 111571] dirfile data source poorly handles error conditions.

[Barth Netterfield]

All of these, (except for the famous memory allocation error... we've been 
down that road several times...), were errors which can only happen due to an 
internal bug in GetData.   Neither faulty data, nor faulty function input/use 
can ever trigger any of them.  I had the 'exit(0)' and the error message 
there for identifying bugs when I wrote the code several years ago.  None of 
them have ever been triggered.  So the bug is an 'invalid' as far as I am 
concerned.