daemonset: Remove unnecessary error returns in strategy code

The nodeShouldRunDaemonPod method does not need to return an error
because there are no scenarios under which it fails. Remove the
error return path for its direct calls as well.

pkg/controller/daemon/update.go

@@ -521,10 +521,7 @@ func (dsc *DaemonSetsController) updatedDesiredNodeCounts(ds *apps.DaemonSet, no
 	var desiredNumberScheduled int
 	for i := range nodeList {
 		node := nodeList[i]
-		wantToRun, _, err := dsc.nodeShouldRunDaemonPod(node, ds)
-		if err != nil {
-			return -1, -1, err
-		}
+		wantToRun, _ := dsc.nodeShouldRunDaemonPod(node, ds)
 		if !wantToRun {
 			continue
 		}