treewide: cleanup function receiver names

Change-Id: I0575175ea249a2bd39b4b7769e49a9995fae6f6d
Reviewed-on: https://review.monogon.dev/c/monogon/+/2959
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/cloud/shepherd/provider/equinix/updater.go b/cloud/shepherd/provider/equinix/updater.go
index 56d78c1..15b218b 100644
--- a/cloud/shepherd/provider/equinix/updater.go
+++ b/cloud/shepherd/provider/equinix/updater.go
@@ -41,9 +41,9 @@
 	cl ecl.Client
 }
 
-func (c *UpdaterConfig) New(cl ecl.Client) (*Updater, error) {
+func (u *UpdaterConfig) New(cl ecl.Client) (*Updater, error) {
 	return &Updater{
-		config: c,
+		config: u,
 		cl:     cl,
 	}, nil
 }