i2c: designware: Fix return value check in navi_amd_register_client()

In case of error, the function i2c_new_client_device() returns
ERR_PTR() and never returns NULL. The NULL test in the return
value check should be replaced with IS_ERR().

Fixes: 17631e8c ("i2c: designware: Add driver support for AMD NAVI GPU")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -132,8 +132,8 @@ static int navi_amd_register_client(struct dw_i2c_dev *dev)
 	info.irq = dev->irq;
 
 	dev->slave = i2c_new_client_device(&dev->adapter, &info);
-	if (!dev->slave)
-		return -ENODEV;
+	if (IS_ERR(dev->slave))
+		return PTR_ERR(dev->slave);
 
 	return 0;
 }