ALSA: hda/cirrus - Fix the digital beep registration

commit a86b1a2cd2f81f74e815e07f756edd7bc5b6f034 upstream.

The argument passed to snd_hda_attach_beep_device() is a widget NID
while spec->beep_amp holds the composed value for amp controls.

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