wdclient: reuse isCanceledErr for the elapsed-deadline check

weed/wdclient/filer_client.go

@@ -2,7 +2,6 @@ package wdclient
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"math/rand"
 	"strings"
@@ -791,9 +790,9 @@ func (p *filerVolumeProvider) LookupVolumeIds(ctx context.Context, volumeIds []s
 			if err != nil {
 				// a caller that gave up says nothing about this filer; gRPC can
 				// surface its own DeadlineExceeded a tick before ctx.Err()
-				// becomes visible, so reinterpret only deadline errors this way
+				// becomes visible, so reinterpret only cancellation errors this way
 				ctxErr := ctx.Err()
-				if ctxErr == nil && (errors.Is(err, context.DeadlineExceeded) || status.Code(err) == codes.DeadlineExceeded) {
+				if ctxErr == nil && isCanceledErr(err) {
 					if dl, ok := ctx.Deadline(); ok && !dl.After(time.Now()) {
 						ctxErr = context.DeadlineExceeded
 					}