dmaengine: ipu: use return value of request_irq

Commit - 653e67f7: "dmaengine: inherit debug settings from the subsystem
for subdirectories" introduced debug option for subdirectories too
This exposed issue with ipu driver not using return value

For now just warn users about it
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/ipu/ipu_idmac.c

@@ -1532,11 +1532,17 @@ static int idmac_alloc_chan_resources(struct dma_chan *chan)
 #ifdef DEBUG
 	if (chan->chan_id == IDMAC_IC_7) {
 		ic_sof = ipu_irq_map(69);
-		if (ic_sof > 0)
-			request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
+		if (ic_sof > 0) {
+			ret = request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
+			if (ret)
+				dev_err(&chan->dev->device, "request irq failed for IC SOF");
+		}
 		ic_eof = ipu_irq_map(70);
-		if (ic_eof > 0)
-			request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
+		if (ic_eof > 0) {
+			ret = request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
+			if (ret)
+				dev_err(&chan->dev->device, "request irq failed for IC EOF");
+		}
 	}
 #endif