spi: bcm-qspi: Fix return value check in bcm_qspi_probe()

In case of error, the function kcalloc() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: fa236a7e ("spi: bcm-qspi: Add Broadcom MSPI driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm-qspi.c

@@ -1174,8 +1174,8 @@ int bcm_qspi_probe(struct platform_device *pdev,
 
 	qspi->dev_ids = kcalloc(num_irqs, sizeof(struct bcm_qspi_dev_id),
 				GFP_KERNEL);
-	if (IS_ERR(qspi->dev_ids)) {
-		ret = PTR_ERR(qspi->dev_ids);
+	if (!qspi->dev_ids) {
+		ret = -ENOMEM;
 		goto qspi_probe_err;
 	}