p11-glue / p11-kit / 16698480972

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Fix running of test teardown on failure

The variable `setup` is set to 1 between `setjmp` and call to `longjmp` in
`p11_test_fail`, so its value is indeterminate upon the second return from
`setjmp`. If the variable is stored in a register, `setjmp` resets it to the
value before the call (0), and the teardown function is not executed. Fix
by making the variable `volatile`.

This bug can be observed, for example, by modifying `test-argv` to fail and
building with LeakSanitizer and optimizations.

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