free null cleanup finale

Don't check for NULL before calling OPENSSL_free

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/apps/ecparam.c b/apps/ecparam.c
index 082df26..dd0e8f5 100644
--- a/apps/ecparam.c
+++ b/apps/ecparam.c
@@ -489,8 +489,7 @@
     BN_free(ec_gen);
     BN_free(ec_order);
     BN_free(ec_cofactor);
-    if (buffer)
-        OPENSSL_free(buffer);
+    OPENSSL_free(buffer);
     BIO_free(in);
     BIO_free_all(out);
     EC_GROUP_free(group);