Mis-named variable in function audio_get_players()

Correct me if I'm wrong, but it appears that on line 1351:

if (!isset($_players_format)) {

should read

if (!isset($_player_format)) {

without the 's' on $_player(s)_format.

With the way it is now, line 1352:

list($_player_name, $_player_format) = _audio_player_build_list();

would always get called, so having the static variables isn't really doing much good here.

Not a big deal, but worth mentioning.