src: remove unused variable

This fixes a compiler warning.

PR-URL: #17150
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Timothy Gu <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: cjihrig

src/node.cc

@@ -887,7 +887,6 @@ void SetupDomainUse(const FunctionCallbackInfo<Value>& args) {
   env->set_using_domains(true);
 
   HandleScope scope(env->isolate());
-  Local<Object> process_object = env->process_object();
 
   CHECK(args[0]->IsArray());
   env->set_domains_stack_array(args[0].As<Array>());