Remove unnecessary uint8 conversion
diff --git a/rpc_util.go b/rpc_util.go
index 932149e..e8f35b8 100644
--- a/rpc_util.go
+++ b/rpc_util.go
@@ -145,7 +145,7 @@
 		return 0, nil, err
 	}
 
-	hdr.T = payloadFormat(uint8(buf[0]))
+	hdr.T = payloadFormat(buf[0])
 	hdr.Length = binary.BigEndian.Uint32(buf[1:])
 
 	if hdr.Length == 0 {