rpcclient: Use atomic types.

Author: jholdstock

rpcclient/go.mod

@@ -1,6 +1,6 @@
 module github.com/decred/dcrd/rpcclient/v8
 
-go 1.18
+go 1.19
 
 require (
 	github.com/decred/dcrd/chaincfg/chainhash v1.0.5

rpcclient/infrastructure.go

@@ -143,7 +143,7 @@ type jsonRequest struct {
 // the returned future will block until the result is available if it's not
 // already.
 type Client struct {
-	id uint64 // atomic, so must stay 64-bit aligned
+	id atomic.Uint64
 
 	// config holds the connection configuration associated with this
 	// client.
@@ -212,7 +212,7 @@ func (c *Client) String() string {
 // this function should be used to ensure the ID is unique amongst all requests
 // being made.
 func (c *Client) NextID() uint64 {
-	return atomic.AddUint64(&c.id, 1)
+	return c.id.Add(1)
 }
 
 // addRequest associates the passed jsonRequest with its id.  This allows the