#26 xbNtx double file-close causes coredump

[Ramon Casha]

In my class destructor I'm doing the following:

index->CloseIndex();
delete index;

("index" is xbNtx*) However the destructor of xbNtx does its
own CloseIndex without checking if it's already been closed.
Apparently sometimes this causes a seg fault.

Suggestion:
in xbNtx::CloseIndex, just after "if(indexfp) fclose( indexfp );"
add "indexfp = NULL"

[Gary Kunkel]

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This code update has been added to the library and will be
available with the next major release,