dmaengine: xilinx: xdma: Fix Judgment of the return value

Fix: make IS_ERR() judge the devm_ioremap_resource() function return.

Fixes: 17ce2522 ("dmaengine: xilinx: xdma: Add xilinx xdma driver")
Signed-off-by: Minjie Du <duminjie@vivo.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20230705113912.16247-1-duminjie@vivo.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/xilinx/xdma.c

@@ -892,7 +892,7 @@ static int xdma_probe(struct platform_device *pdev)
 	}
 
 	reg_base = devm_ioremap_resource(&pdev->dev, res);
-	if (!reg_base) {
+	if (IS_ERR(reg_base)) {
 		xdma_err(xdev, "ioremap failed");
 		goto failed;
 	}