Clear staticcheck, gopls and go.mod warnings

frame.go

@@ -60,14 +60,6 @@ var patterns = []pattern{
 	}},
 }
 
-func patternNames() []string {
-	names := make([]string, len(patterns))
-	for i, p := range patterns {
-		names[i] = p.name
-	}
-	return names
-}
-
 // Every pattern is laid out at full length up front with its checksum at each
 // size, so a sender picks a pattern by choosing a buffer, never by writing one.
 type frameSpec struct {