no naked returns in go; fix auth v3 unit tests
diff --git a/openstack/compute/v2/extensions/servergroups/requests.go b/openstack/compute/v2/extensions/servergroups/requests.go
index c5d5f95..ee98837 100644
--- a/openstack/compute/v2/extensions/servergroups/requests.go
+++ b/openstack/compute/v2/extensions/servergroups/requests.go
@@ -41,14 +41,17 @@
 	_, r.Err = client.Post(createURL(client), b, &r.Body, &gophercloud.RequestOpts{
 		OkCodes: []int{200},
 	})
+	return
 }
 
 // Get returns data about a previously created ServerGroup.
 func Get(client *gophercloud.ServiceClient, id string) (r GetResult) {
 	_, r.Err = client.Get(getURL(client, id), &r.Body, nil)
+	return
 }
 
 // Delete requests the deletion of a previously allocated ServerGroup.
 func Delete(client *gophercloud.ServiceClient, id string) (r DeleteResult) {
 	_, r.Err = client.Delete(deleteURL(client, id), nil)
+	return
 }