ALSA: ctxfi: fix typo in comment

Spelling mistake (triple letters) in comment.
Detected with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Link: https://lore.kernel.org/r/20220521111145.81697-44-Julia.Lawall@inria.fr
Signed-off-by: Takashi Iwai <tiwai@suse.de>