Filip Roséen authored Mar 21, 2017 and Hugo Beauzée-Luyssen committed Mar 29, 2017

This will cancel any pending request for preparsing the relevant
playlist_item_t as preparsing the entity:

 - is redundant since we are about to start playback,
 - can remove metadata added during playback, and;
 - can lead to duplicate entries in the playlist if the
   playlist_item_t is a directory (as children are added each time
   such entity is "played").

fixes: #17441
fixes: #17232

Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>