powerpc/4xx: Fix return value check in hsta_msi_probe()

In case of error, the functions platform_get_resource() and kmalloc()
returns NULL not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/sysdev/ppc4xx_hsta_msi.c

···
 	struct pci_controller *phb;
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (IS_ERR(mem)) {
+	if (!mem) {
 		dev_err(dev, "Unable to get mmio space\n");
 		return -EINVAL;
 	}
···
 		goto out;
 
 	ppc4xx_hsta_msi.irq_map = kmalloc(sizeof(int) * irq_count, GFP_KERNEL);
-	if (IS_ERR(ppc4xx_hsta_msi.irq_map)) {
+	if (!ppc4xx_hsta_msi.irq_map) {
 		ret = -ENOMEM;
 		goto out1;
 	}