crypto: qce - Provide dev_err_probe() status on DMA failure

On multiple occasions the qce device have shown up in devices_deferred,
without the explanation that this came from the failure to acquire the
DMA channels from the associated BAM.

Use dev_err_probe() to associate this context with the failure to faster
pinpoint the culprit when this happens in the future.

Signed-off-by: Bjorn Andersson <[e-mail]>
Reviewed-by: Abel Vesa <[e-mail]>
Reviewed-by: David Heidelberg <[e-mail]>
Reviewed-by: Konrad Dybcio <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/qce/dma.c

···
 
 	dma->txchan = dma_request_chan(dev, "tx");
 	if (IS_ERR(dma->txchan))
-		return PTR_ERR(dma->txchan);
+		return dev_err_probe(dev, PTR_ERR(dma->txchan),
+				     "Failed to get TX DMA channel\n");
 
 	dma->rxchan = dma_request_chan(dev, "rx");
 	if (IS_ERR(dma->rxchan)) {
-		ret = PTR_ERR(dma->rxchan);
+		ret = dev_err_probe(dev, PTR_ERR(dma->rxchan),
+				    "Failed to get RX DMA channel\n");
 		goto error_rx;
 	}