ALSA: firewire: Drop superfluous ioctl PCM ops

All the PCM ioctl ops of ALSA FireWire drivers do nothing but calling
the default handler.

Now PCM core accepts NULL as the default ioctl ops(*), so let's drop
altogether.

(*) commit fc033cbf6f ("ALSA: pcm: Allow NULL ioctl ops")

Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191210061145.24641-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/isight.c

@@ -441,7 +441,6 @@ static int isight_create_pcm(struct isight *isight)
 	static const struct snd_pcm_ops ops = {
 		.open      = isight_open,
 		.close     = isight_close,
-		.ioctl     = snd_pcm_lib_ioctl,
 		.hw_params = isight_hw_params,
 		.hw_free   = isight_hw_free,
 		.prepare   = isight_prepare,