perf: avoid calling fastly_object_store_open twice by using the return status from the first call

the second call is not needed and could cause two handles to be created for the object store which is not required

Author: Jake Champion

c-dependencies/js-compute-runtime/builtins/object-store.cpp

@@ -407,7 +407,7 @@ bool constructor(JSContext *cx, unsigned argc, JS::Value *vp) {
     return false;
   }
 
-  if (!HANDLE_RESULT(cx, fastly_object_store_open(name_chars, name_len, &object_store_handle))) {
+  if (!HANDLE_RESULT(cx, status)) {
     return false;
   }