Revert "XLALFrStreamClose(): change from int-return to void-return"

- This reverts commit 3c47cb0978b780e1f0c8c1defef62bf1dfcae540.
- Refs #1275
SWIG: allow destructor functions to return either void or int

- fail if a destructor function returns a different type
- ignore int return and clear XLAL error status before/after
  calling destructor, to clear any errors raised by function
- refs #1275