Lua: don't lock playlist before playlist_Play

modules/misc/lua/libs/playlist.c

@@ -87,9 +87,7 @@ static int vlclua_playlist_skip( lua_State * L )
 static int vlclua_playlist_play( lua_State * L )
 {
     playlist_t *p_playlist = vlclua_get_playlist_internal( L );
-    PL_LOCK;
     playlist_Play( p_playlist );
-    PL_UNLOCK;
     vlclua_release_playlist_internal( p_playlist );
     return 0;
 }