ALSA: mips: 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/20191105151856.10785-3-tiwai@suse.deSigned-off-by: NTakashi Iwai <tiwai@suse.de>

sound/mips/hal2.c

@@ -741,8 +741,7 @@ static int hal2_pcm_create(struct snd_hal2 *hal2)
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 			&hal2_capture_ops);
 	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
-					   snd_dma_continuous_data(GFP_KERNEL),
-					   0, 1024 * 1024);
+					   NULL, 0, 1024 * 1024);
 
 	return 0;
 }