Clean up the mess in i2d_EC_PRIVATEKEY()

Use a few local variables to make the checks at the start slightly less
unappealing. Use those to simplify the conditionals a bit and avoid a
particularly silly exit code. ok is set unless ret is 0, so what do you
think 'return (ok ? ret : 0);' returns? By the way, ret < 0 is an error
as well.

While most of the stuff in this file could use a lot more cleanup, I think
the first layer of cockroaches has been exterminated and there's even some
faint golden glimmer between the turds.

Let's shelve the biohazard warnings for now.

ok jsing

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