Remove unused variable

Reviewed-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2566)

apps/openssl.c

@@ -58,7 +58,6 @@ static void list_type(FUNC_TYPE ft);
 static void list_disabled(void);
 char *default_config_file = NULL;
 
-static CONF *config = NULL;
 BIO *bio_in = NULL;
 BIO *bio_out = NULL;
 BIO *bio_err = NULL;
@@ -248,8 +247,6 @@ int main(int argc, char *argv[])
  end:
     OPENSSL_free(copied_argv);
     OPENSSL_free(default_config_file);
-    NCONF_free(config);
-    config = NULL;
     lh_FUNCTION_free(prog);
     OPENSSL_free(arg.argv);