ASoC: soc-generic-dmaengine-pcm: separate max_buffer_size assignment

The config->pcm_hardware may be NULL when config->prealloc_buffer_size
is not zero, so it is better to move max_buffer_size assignment under
a separate condition.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1642646642-15908-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-generic-dmaengine-pcm.c

@@ -237,13 +237,15 @@ static int dmaengine_pcm_new(struct snd_soc_component *component,
 	size_t max_buffer_size;
 	unsigned int i;
 
-	if (config && config->prealloc_buffer_size) {
+	if (config && config->prealloc_buffer_size)
 		prealloc_buffer_size = config->prealloc_buffer_size;
-		max_buffer_size = config->pcm_hardware->buffer_bytes_max;
-	} else {
+	else
 		prealloc_buffer_size = prealloc_buffer_size_kbytes * 1024;
+
+	if (config && config->pcm_hardware && config->pcm_hardware->buffer_bytes_max)
+		max_buffer_size = config->pcm_hardware->buffer_bytes_max;
+	else
 		max_buffer_size = SIZE_MAX;
-	}
 
 	for_each_pcm_streams(i) {
 		struct snd_pcm_substream *substream = rtd->pcm->streams[i].substream;