addressed review comments

Author: YamunadeviShanmugam

test/extended/cli/admin.go

@@ -554,9 +554,7 @@ var _ = g.Describe("[sig-cli] oc adm", func() {
 		if cleanup != nil {
 			defer cleanup()
 		}
-		if err != nil {
-			o.Expect(err).NotTo(o.HaveOccurred(), "PrepareImagePullSecretAndCABundle failed")
-		}
+		o.Expect(err).NotTo(o.HaveOccurred(), "PrepareImagePullSecretAndCABundle failed")
 		args := append([]string{"--file", "image-references"}, regArgs...)
 		args = append(args, payloadImage)
 		out, err := oc.AsAdmin().Run("adm", "release", "extract").Args(args...).Output()