ALSA: hda - Fix unbalance of i915 module refcount

The commit dba9b7b6 ("ALSA: hda - Fix doubly initialization of
i915 component") contained a typo that leads to the unbalance of i915
module reference.  The value to be checked is not chip->driver_type
but chip->driver_caps.

Fixes: dba9b7b6

 ("ALSA: hda - Fix doubly initialization of i915 component")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196219
Reported-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>