simplify connection handling when setting the receive buffer

sys_conn_no_oob.go

@@ -8,8 +8,6 @@ func newConn(c net.PacketConn) (rawConn, error) {
 	return &basicConn{PacketConn: c}, nil
 }
 
-func inspectReadBuffer(interface{}) (int, error) {
-	return 0, nil
-}
+func inspectReadBuffer(any) (int, error) { return 0, nil }
 
 func (i *packetInfo) OOB() []byte { return nil }