efi_selftest: free handles on teardown()

In the block device selftest, make the handles pointer global and free it
also in teardown(), to simplify error handling.

We also need to nullify the pointer after freeing it on the normal path,
to avoid freeing it a second time during teardown().

Signed-off-by: Vincent Stehlé <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>

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