ASoC: dwc: Drop superfluous PCM preallocation error checks

snd_pcm_lib_preallocate_pages() and co always succeed, so the error
check is simply redundant.  Drop it.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/dwc/dwc-pcm.c

@@ -249,9 +249,10 @@ static int dw_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	size_t size = dw_pcm_hardware.buffer_bytes_max;
 
-	return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
+	snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
 			SNDRV_DMA_TYPE_CONTINUOUS,
 			snd_dma_continuous_data(GFP_KERNEL), size, size);
+	return 0;
 }
 
 static void dw_pcm_free(struct snd_pcm *pcm)