ASoC: pcm: Make ioctl ops optional

Now PCM core accepts the NULL ioctl ops as default, and passing a proper
ioctl ops is no longer mandatory.  Adjust soc_new_pcm() to allow also
the NULL for component ioctl ops, too.
Acked-by: NMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20191121190709.29121-2-tiwai@suse.deSigned-off-by: NTakashi Iwai <tiwai@suse.de>

sound/soc/soc-pcm.c

@@ -3005,7 +3005,6 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;
 		rtd->ops.close		= dpcm_fe_dai_close;
 		rtd->ops.pointer	= soc_pcm_pointer;
-		rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
 	} else {
 		rtd->ops.open		= soc_pcm_open;
 		rtd->ops.hw_params	= soc_pcm_hw_params;
@@ -3014,12 +3013,13 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
 		rtd->ops.hw_free	= soc_pcm_hw_free;
 		rtd->ops.close		= soc_pcm_close;
 		rtd->ops.pointer	= soc_pcm_pointer;
-		rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
 	}
 
 	for_each_rtd_components(rtd, rtdcom, component) {
 		const struct snd_soc_component_driver *drv = component->driver;
 
+		if (drv->ioctl)
+			rtd->ops.ioctl		= snd_soc_pcm_component_ioctl;
 		if (drv->copy_user)
 			rtd->ops.copy_user	= snd_soc_pcm_component_copy_user;
 		if (drv->page)