ALSA: hda - Fix yet another i915 pointer leftover in error path

The hdac_acomp object in hdac_i915.c is left as assigned even after
binding with i915 actually fails, and this leads to the WARN_ON() at
the next load of the module.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94736


Signed-off-by: Takashi Iwai <tiwai@suse.de>