internal/app: check transmitted ops

This simulates params to shim and this is the last step before params to shim is merged.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/sppulse.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"encoding/gob"
 	"errors"
 	"fmt"
 	"io"
@@ -14,6 +15,8 @@ import (
 
 const pulseCookieSizeMax = 1 << 8
 
+func init() { gob.Register(new(spPulseOp)) }
+
 // spPulseOp exports the PulseAudio server to the container.
 type spPulseOp struct {
 	// PulseAudio cookie data, populated during toSystem if a cookie is present.