[PATCH] ASoC: fsl_asrc_dma: fix error handling for DMA channel retrieval

[shengjiu . wang]

From: Shengjiu Wang <shengjiu.wang@xxxxxxx>

The original check used `if (!tmp_chan)`, which only catches NULL pointers.
However `asrc->get_dma_channel()` returns an error pointer. The NULL check
will always succeed, so replace it with `IS_ERR(tmp_chan)` to correctly
detect errors.

Fixes: b4136c0d69ea ("ASoC: fsl_asrc: check the second front-end DMA channel")
Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
---
 sound/soc/fsl/fsl_asrc_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_asrc_dma.c b/sound/soc/fsl/fsl_asrc_dma.c
index b417de6abebe..b39d3d76d26a 100644
--- a/sound/soc/fsl/fsl_asrc_dma.c
+++ b/sound/soc/fsl/fsl_asrc_dma.c
@@ -251,7 +251,7 @@ static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
 
 		/* Get DMA request of Front-End */
 		tmp_chan = asrc->get_dma_channel(pair, dir);
-		if (!tmp_chan) {
+		if (IS_ERR(tmp_chan)) {
 			dma_release_channel(pair->dma_chan[!dir]);
 			pair->dma_chan[!dir] = NULL;
 			return -EINVAL;
-- 
2.34.1