no naked returns in go; fix auth v3 unit tests
diff --git a/openstack/common/extensions/requests.go b/openstack/common/extensions/requests.go
index bc1ce3e..46b7d60 100755
--- a/openstack/common/extensions/requests.go
+++ b/openstack/common/extensions/requests.go
@@ -8,6 +8,7 @@
 // Get retrieves information for a specific extension using its alias.
 func Get(c *gophercloud.ServiceClient, alias string) (r GetResult) {
 	_, r.Err = c.Get(ExtensionURL(c, alias), &r.Body, nil)
+	return
 }
 
 // List returns a Pager which allows you to iterate over the full collection of extensions.