whelp: Avoid a crash, when the search path has an empty segment

[winspool]

The double colon in $PATH let whelp segfault, when whelp is searching for available help files.

-- Regards ... Detlef

[jmalak]

The fix should provide a transition to processing the next segment if the segment is empty. The proposed fix only fixes the crash, not the bug in the algorithm that caused the problem.

[jmalak]

What about following solution

        if( *p != '\0' ) {
            strcpy( buf, p );
            len = strlen( buf ) - 1;
#ifdef __UNIX__
            if( buf[len] == '/' )
                buf[len] = '\0';
#else
            if( buf[len] == '/' || buf[len] == '\\' )
                buf[len] = '\0';
#endif
            list = scanDirectory( buf, list );
        }

[jmalak]

fixed correctly in git repository