cli/registry/client: remove deprecated RepoNameForReference

This was deprecated in 6f46cd2f4b,
which is part of v28.x, and no longer used, so we can remove it.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/registry/client/endpoint.go

@@ -105,13 +105,6 @@ func getHTTPTransport(authConfig registrytypes.AuthConfig, endpoint registry.API
 	return transport.NewTransport(base, modifiers...), nil
 }
 
-// RepoNameForReference returns the repository name from a reference.
-//
-// Deprecated: this function is no longer used and will be removed in the next release.
-func RepoNameForReference(ref reference.Named) (string, error) {
-	return reference.Path(reference.TrimNamed(ref)), nil
-}
-
 type existingTokenHandler struct {
 	token string
 }