MT#55283 don't run unscheduled player

Prevents race condition of running a player timer when it has already
been descheduled.

Change-Id: If45fad24572be19b955f2c2bd01384713bcfda07
(cherry picked from commit 2a178b49b8)

daemon/media_player.c

@@ -355,6 +355,8 @@ static void media_player_coder_add_packet(struct media_player_coder *c,
 
 static void media_player_read_decoded_packet(struct media_player *mp) {
 	struct media_player_cache_entry *entry = mp->cache_entry;
+	if (!entry)
+		return;
 
 	unsigned int read_idx = mp->cache_read_idx;
 	ilog(LOG_DEBUG, "Buffered media player reading packet #%u", read_idx);