Revert "test/eventfd-disable: Fix reading uninitialized variable"

We're just reading into these buffers, they need not get cleared.
In fact for some tests it's beneficial to NOT have them cleared,
as the faulting tends to show other issues.

This reverts commit d879fbf9134e04f1e34e56b3575f9fafe9949c2d.
1 file changed