ALSA: hda - Fix memory leaks at module unload

commit 59cad16bc6deb85bd2a464da92bbaae289f0286f upstream.

Some caches aren't released properly at module unloading time.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>