Return the EC point conversion form stored on an elliptic-curve EVP_PKEY.
Declared in <openssl/evp.h>
<openssl/evp.h>
int EVP_PKEY_get_ec_point_conv_form(EVP_PKEY const* pkey);
Point conversion form (see EC_GROUP_get_point_conversion_form), or 0 on error.