internal/pipewire: reset per-roundtrip state once per call

This was left in consume when relocating per-roundtrip code out of the per-receive consume method.

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

internal/pipewire/pipewire.go

@@ -63,7 +63,7 @@ type Context struct {
 	generation Long
 	// Pending file descriptors to be sent with the next message.
 	pendingFiles []int
-	// File count kept track of in [Header].
+	// File count already kept track of in [Header].
 	headerFiles int
 	// Files from the server. This is discarded on every Roundtrip so eventProxy
 	// implementations must make sure to close them to avoid leaking fds.
@@ -585,6 +585,9 @@ func (ctx *Context) roundtrip() (err error) {
 	if err = ctx.sendmsg(ctx.buf, ctx.pendingFiles...); err != nil {
 		return
 	}
+	ctx.buf = ctx.buf[:0]
+	ctx.pendingFiles = ctx.pendingFiles[:0]
+	ctx.headerFiles = 0
 
 	defer func() {
 		var danglingFiles DanglingFilesError
@@ -661,10 +664,6 @@ func (ctx *Context) consume(receiveRemaining []byte) (remaining []byte, err erro
 		return
 	}()
 
-	ctx.buf = ctx.buf[:0]
-	ctx.pendingFiles = ctx.pendingFiles[:0]
-	ctx.headerFiles = 0
-
 	if remaining, err = ctx.recvmsg(receiveRemaining); err != nil {
 		return
 	}