add chunk_alloc to playlist.c #2

dc_thread_playlist was asking for invalid indices
since previously the name buffer would have been valid
it just got whatever junk data was left over

add dc_discard_playlist_pointers for HAVE_DIRCACHE targets
this allows the dc_playlist_thread to stop its current lookup loop

Change-Id: I6f25b97b8c4e314d27c5e1e6ff0925b5a3e93f26

apps/playlist.h

@@ -28,6 +28,7 @@
 #include "kernel.h"
 #include "metadata.h"
 #include "rbpaths.h"
+#include "chunk_alloc.h"
 
 #define PLAYLIST_ATTR_QUEUED    0x01
 #define PLAYLIST_ATTR_INSERTED  0x02
@@ -84,10 +85,10 @@ struct playlist_info
                               global_settings.max_files_in_playlist */
     int  num_inserted_tracks; /* number of tracks inserted           */
     volatile unsigned long *indices; /* array of indices            */
-    int buffer_handle;   /* handle to the below buffer (-1 if non-buflib) */
-    volatile char *buffer;/* buffer for in-ram playlists        */
-    int  buffer_size;    /* size of buffer                          */
-    int  buffer_end_pos; /* last position where buffer was written  */
+
+    struct chunk_alloc_header name_chunk_buffer; /* chunk buffer for 
+                                                    in-ram playlist */
+
     int  index;          /* index of current playing track          */
     int  first_index;    /* index of first song in playlist         */
     int  amount;         /* number of tracks in the index           */