playlist: Make sure we don't pl_Release(p_playlist).

In those case the pl_* API doesn't seems convienent/well used.

modules/gui/beos/InterfaceWindow.cpp

@@ -354,7 +354,7 @@ InterfaceWindow::~InterfaceWindow()
     }
     if( p_playlist )
     {
-        pl_Release( p_playlist );
+        vlc_object_release( p_playlist );
     }
 #if 0
     if( fPlaylistWindow )

modules/gui/wxwidgets/dialogs/playlist.cpp

@@ -424,7 +424,7 @@ Playlist::~Playlist()
     var_DelCallback( p_playlist, "intf-change", PlaylistChanged, this );
     var_DelCallback( p_playlist, "item-append", ItemAppended, this );
     var_DelCallback( p_playlist, "item-deleted", ItemDeleted, this );
-    pl_Release( p_playlist );
+    vlc_object_release( p_playlist );
 }
 
 /**********************************************************************

modules/gui/wxwidgets/playlist_manager.cpp

@@ -187,7 +187,7 @@ PlaylistManager::~PlaylistManager()
     var_DelCallback( p_playlist, "intf-change", PlaylistChanged, this );
     var_DelCallback( p_playlist, "item-append", ItemAppended, this );
     var_DelCallback( p_playlist, "item-deleted", ItemDeleted, this );
-    pl_Release( p_playlist );
+    vlc_object_release( p_playlist );
 }
 
 /*****************************************************************************

modules/misc/lua/libs/playlist.c

@@ -56,7 +56,7 @@ playlist_t *vlclua_get_playlist_internal( lua_State *L )
 
 void vlclua_release_playlist_internal( playlist_t *p_playlist )
 {
-    pl_Release( p_playlist );
+    vlc_object_release( p_playlist );
 }
 
 static int vlclua_playlist_prev( lua_State * L )