Don't return an extra newline

dovecot/dict.go

@@ -74,6 +74,7 @@ func (p *DictProxyServer) handleLookup(ctx context.Context, lw unix.LineResponse
 	if err := json.NewEncoder(&buf).Encode(obj); err != nil {
 		return err
 	}
-	buf.Write([]byte{'\n'})
+	// json Encode will already add a newline.
+	//buf.Write([]byte{'\n'})
 	return lw.WriteLine(buf.Bytes())
 }