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The recent code refactoring missed the initialization of the chip
variable as its allocation was moved to card->private_data.
Let's fix it.

Fixes: 21a9314c

 ("ALSA: als300: Allocate resources with device-managed APIs")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/s5hh7goocid.wl-tiwai@suse.de

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