ALSA: drivers: Remove superfluous snd_dma_continuous_data()

The recent change (commit 08422d2c: "ALSA: memalloc: Allow NULL
device for SNDRV_DMA_TYPE_CONTINUOUS type") made the PCM preallocation
helper accepting NULL as the device pointer for the default usage.
Drop the snd_dma_continuous_data() usage that became superfluous from
the callers.

Link: https://lore.kernel.org/r/20191105151856.10785-2-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/dummy.c

@@ -702,7 +702,7 @@ static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
 	if (!fake_buffer) {
 		snd_pcm_lib_preallocate_pages_for_all(pcm,
 			SNDRV_DMA_TYPE_CONTINUOUS,
-			snd_dma_continuous_data(GFP_KERNEL),
+			NULL,
 			0, 64*1024);
 	}
 	return 0;

sound/drivers/ml403-ac97cr.c

@@ -1242,7 +1242,7 @@ snd_ml403_ac97cr_pcm(struct snd_ml403_ac97cr *ml403_ac97cr, int device)
 	ml403_ac97cr->pcm = pcm;
 
 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
-					  snd_dma_continuous_data(GFP_KERNEL),
+					  NULL,
 					  64 * 1024,
 					  128 * 1024);
 	return 0;

sound/drivers/pcsp/pcsp_lib.c

@@ -352,8 +352,8 @@ int snd_pcsp_new_pcm(struct snd_pcsp *chip)
 
 	snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
 					      SNDRV_DMA_TYPE_CONTINUOUS,
-					      snd_dma_continuous_data
-					      (GFP_KERNEL), PCSP_BUFFER_SIZE,
+					      NULL,
+					      PCSP_BUFFER_SIZE,
 					      PCSP_BUFFER_SIZE);
 
 	return 0;