Fix openssl_seal()'s $iv parameter #624
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The $iv parameter is an output-only parameter, the value passed in is not used.
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This was incorrectly added in #327.
The implementation of openssl_seal() shows that while the
$ivparameter is briefly checked, its value is never used. The check is only to verify its presence, since it does not make sense to encrypt and then throw away the IV.This resulted in this perfectly fine code being flagged.