Bad conditional in vSphereLogin function

With this conditional being == instead of !=, a login would never actually be attempted by this provider, and disk attachments would fail.

pkg/cloudprovider/providers/vsphere/vsphere.go

@@ -360,7 +360,7 @@ func vSphereLogin(vs *VSphere, ctx context.Context) error {
 	m := session.NewManager(vs.client.Client)
 	// retrieve client's current session
 	u, err := m.UserSession(ctx)
-	if err == nil && u == nil {
+	if err == nil && u != nil {
 		// current session is valid
 		return nil
 	}