use correct data type for key_str in get_key,

[retrnace]

use correct data type for key_str in get_key

To fix, change the below line in lib/openssl/eccx08_cmd_defns.c

    char* key_str[32];
    EVP_PKEY* pkey;

    DEBUG_ENGINE("Entered\n");

to

    char key_str[32];
    EVP_PKEY* pkey;

    DEBUG_ENGINE("Entered\n");