Berthold Stoeger 167b41b6e5 Cleanup: unglobalize variables in datatrak.c
It's a drop in the bucket, but let's remove some unnecessary
global variables. With one exception these variables were only
used in one function anyway. The other one can be passed as a
parameter.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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