alsa: Free the global config cache to remove a lot of reported leaks
alsa: Free the global config cache to remove a lot of reported leaks

Signed-off-by: Lauri Kasanen <49063caab384794a1223847a530f06bca47c7ffd@operamail.com>

mmozeiko/OpenAL-Soft,arkana-fts/openal-soft,dapetcu21/openal-soft,franklixuefei/openal-soft,aaronmjacobs/openal-soft,arkana-fts/openal-soft,rryan/openal-soft,Wemersive/openal-soft,EddieRingle/openal-soft,Wemersive/openal-soft,franklixuefei/openal-soft,alexxvk/openal-soft,aaronmjacobs/openal-soft,rryan/openal-soft,BeamNG/openal-soft,mmozeiko/OpenAL-Soft,alexxvk/openal-soft,BeamNG/openal-soft,jims/openal-soft,jims/openal-soft,EddieRingle/openal-soft,irungentoo/openal-soft-tox,irungentoo/openal-soft-tox