dmaengine: ste_dma40: Add missing IRQ check in d40_probe

Check for the return value of platform_get_irq(): if no interrupt
is specified, it wouldn't make sense to call request_irq().

Fixes: 8d318a5 ("DMAENGINE: Support for ST-Ericssons DMA40 block v3")
Signed-off-by: Ruan Jinjie <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: ruanjinjie

drivers/dma/ste_dma40.c

@@ -3590,6 +3590,10 @@ static int __init d40_probe(struct platform_device *pdev)
 	spin_lock_init(&base->lcla_pool.lock);
 
 	base->irq = platform_get_irq(pdev, 0);
+	if (base->irq < 0) {
+		ret = base->irq;
+		goto destroy_cache;
+	}
 
 	ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base);
 	if (ret) {