Parse DER-enconded length into a size_t instead of an int
Parse DER-enconded length into a size_t instead of an int

This avoids a possibly implementation-defined signed (int) to unsigned
(size_t) conversion portably.

afk11/secp256k1,evoskuil/secp256k1,peterdettman/secp256k1,evoskuil/secp256k1,afk11/secp256k1,pmienk/secp256k1,ElementsProject/secp256k1-zkp,afk11/secp256k1,ElementsProject/secp256k1-zkp,bitcoin/secp256k1,bitcoin-core/secp256k1,libbitcoin/secp256k1,afk11/secp256k1,evoskuil/secp256k1,afk11/secp256k1,pmienk/secp256k1,evoskuil/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1,libbitcoin/secp256k1,bitcoin-core/secp256k1,peterdettman/secp256k1,pmienk/secp256k1,bitcoin/secp256k1,libbitcoin/secp256k1,pmienk/secp256k1,bitcoin/secp256k1,evoskuil/secp256k1,libbitcoin/secp256k1,libbitcoin/secp256k1,pmienk/secp256k1