Subject: tohexstr() unit test helper overflow buffer
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tohexstr() documentation says the target buffer size should
be at least len / 2 + 1 when it is len * 2 + 1.
This makes the GOST unit test to fail on my OS X configured
with native PKCS#11 (and of course for an unrelated reason :-).
Fix is obvious and should be done in all versions as this
function definition occurs more than once...