Media addon server: Suppress warnings

Use media_format.Clear() to suppress -Werror=class-memaccess
pointed out by gcc8.

Change-Id: Ib75ee4cb7aa8018af25dd6bdcf79b4dd7c14d240

src/servers/media_addon/MediaFilePlayer.cpp

@@ -72,7 +72,7 @@ MediaFilePlayer::MediaFilePlayer(const char* media_type,
 	if (fInitCheck != B_OK)
 		return;
 
-	memset(&fPlayFormat, 0, sizeof(fPlayFormat));
+	fPlayFormat.Clear();
 
 	for (int i=0; i < fPlayFile->CountTracks(); i++) {
 		BMediaTrack* track = fPlayFile->TrackAt(i);