orangefs: clean up debugfs

We recently refactored the Orangefs debugfs code.
The refactor seemed to trigger [email protected]'s
static tester to find a possible double-free in the code.

While designing the fix we saw a condition under which the
buffer being freed could also be overflowed.

We also realized how to rebuild the related debugfs file's
"contents" (a string) without deleting and re-creating the file.

This fix should eliminate the possible double-free, the
potential overflow and improve code readability.

Signed-off-by: Mike Marshall <[email protected]>
Signed-off-by: Martin Brandenburg <[email protected]>

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