HPCC-9665 Uninitialized variable in dadfs.cpp

Messed up refactoring left code rather dodgy

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4618 from richardkchapman/uninitialized-dadfs

HPCC-9665 Uninitialized variable in dadfs.cpp

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>