ARM: cleanup: soc_device_register() error checking

soc_device_register() never returns NULL, it only ever returns an
error pointer or a valid pointer.  Use the right function (IS_ERR())
to check this.

soc_device_to_device() only ever returns &soc_dev->dev, and so can
never return an error or NULL if the pointer passed into it was
valid, so there's no point checking its return.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-integrator/integrator_ap.c

@@ -540,16 +540,14 @@ static void __init ap_init_of(void)
 					   'A' + (ap_sc_id & 0x0f));
 
 	soc_dev = soc_device_register(soc_dev_attr);
-	if (IS_ERR_OR_NULL(soc_dev)) {
+	if (IS_ERR(soc_dev)) {
 		kfree(soc_dev_attr->revision);
 		kfree(soc_dev_attr);
 		return;
 	}
 
 	parent = soc_device_to_device(soc_dev);
-
-	if (!IS_ERR_OR_NULL(parent))
-		integrator_init_sysfs(parent, ap_sc_id);
+	integrator_init_sysfs(parent, ap_sc_id);
 
 	of_platform_populate(root, of_default_bus_match_table,
 			ap_auxdata_lookup, parent);

arch/arm/mach-integrator/integrator_cp.c

@@ -364,17 +364,14 @@ static void __init intcp_init_of(void)
 					   'A' + (intcp_sc_id & 0x0f));
 
 	soc_dev = soc_device_register(soc_dev_attr);
-	if (IS_ERR_OR_NULL(soc_dev)) {
+	if (IS_ERR(soc_dev)) {
 		kfree(soc_dev_attr->revision);
 		kfree(soc_dev_attr);
 		return;
 	}
 
 	parent = soc_device_to_device(soc_dev);
-
-	if (!IS_ERR_OR_NULL(parent))
-		integrator_init_sysfs(parent, intcp_sc_id);
-
+	integrator_init_sysfs(parent, intcp_sc_id);
 	of_platform_populate(root, of_default_bus_match_table,
 			intcp_auxdata_lookup, parent);
 }

arch/arm/mach-ux500/cpu.c

@@ -145,14 +145,13 @@ struct device * __init ux500_soc_device_init(const char *soc_id)
 	soc_info_populate(soc_dev_attr, soc_id);
 
 	soc_dev = soc_device_register(soc_dev_attr);
-	if (IS_ERR_OR_NULL(soc_dev)) {
+	if (IS_ERR(soc_dev)) {
 	        kfree(soc_dev_attr);
 		return NULL;
 	}
 
 	parent = soc_device_to_device(soc_dev);
-	if (!IS_ERR_OR_NULL(parent))
-		device_create_file(parent, &ux500_soc_attr);
+	device_create_file(parent, &ux500_soc_attr);
 
 	return parent;
 }