Update vendor for next release (#1343)

vendor/go.uber.org/atomic/error.go

@@ -1,4 +1,6 @@
-// Copyright (c) 2016 Uber Technologies, Inc.
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -20,36 +22,30 @@
 
 package atomic
 
-// Error is an atomic type-safe wrapper around Value for errors
-type Error struct{ v Value }
+// Error is an atomic type-safe wrapper for error values.
+type Error struct {
+	_ nocmp // disallow non-atomic comparison
 
-// errorHolder is non-nil holder for error object.
-// atomic.Value panics on saving nil object, so err object needs to be
-// wrapped with valid object first.
-type errorHolder struct{ err error }
+	v Value
+}
 
-// NewError creates new atomic error object
-func NewError(err error) *Error {
-	e := &Error{}
-	if err != nil {
-		e.Store(err)
+var _zeroError error
+
+// NewError creates a new Error.
+func NewError(v error) *Error {
+	x := &Error{}
+	if v != _zeroError {
+		x.Store(v)
 	}
-	return e
+	return x
 }
 
-// Load atomically loads the wrapped error
-func (e *Error) Load() error {
-	v := e.v.Load()
-	if v == nil {
-		return nil
-	}
-
-	eh := v.(errorHolder)
-	return eh.err
+// Load atomically loads the wrapped error.
+func (x *Error) Load() error {
+	return unpackError(x.v.Load())
 }
 
-// Store atomically stores error.
-// NOTE: a holder object is allocated on each Store call.
-func (e *Error) Store(err error) {
-	e.v.Store(errorHolder{err: err})
+// Store atomically stores the passed error.
+func (x *Error) Store(v error) {
+	x.v.Store(packError(v))
 }