src: remove unused variable in node_crypto

env was unused since the ref'd commit

Ref: e34ee1d
PR-URL: #11361
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

Author: cjihrig

src/node_crypto.cc

@@ -1813,7 +1813,6 @@ template <class Base>
 void SSLWrap<Base>::LoadSession(const FunctionCallbackInfo<Value>& args) {
   Base* w;
   ASSIGN_OR_RETURN_UNWRAP(&w, args.Holder());
-  Environment* env = w->ssl_env();
 
   if (args.Length() >= 1 && Buffer::HasInstance(args[0])) {
     ssize_t slen = Buffer::Length(args[0]);