drivers/firmware: return actual error on sysfs init

index e0f1cb3..9e867f4 100644
@@ -657,8 +657,10 @@ static int __init dmi_sysfs_init(void)
 		goto err;
 
 	dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);
-	if (!dmi_kset)
+	if (IS_ERR(dmi_kset)) {
+		error = PTR_ERR(dmi_kset);
 		goto err;
+	}
 
 	val = 0;
 	error = dmi_walk(dmi_sysfs_register_handle, &val);

index e229576..c3bc8f1 100644
@@ -757,8 +757,8 @@ edd_init(void)
 	}
 
 	edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
-	if (!edd_kset)
-		return -ENOMEM;
+	if (IS_ERR(edd_kset))
+		return PTR_ERR(edd_kset);
 
 	for (i = 0; i < edd_num_devices(); i++) {
 		edev = kzalloc(sizeof (*edev), GFP_KERNEL);

index 463c565..057568f 100644
@@ -730,9 +730,9 @@ int efivars_sysfs_init(void)
 	       EFIVARS_DATE);
 
 	efivars_kset = kset_create_and_add("vars", NULL, parent_kobj);
-	if (!efivars_kset) {
+	if (IS_ERR(efivars_kset)) {
 		printk(KERN_ERR "efivars: Subsystem registration failed.\n");
-		return -ENOMEM;
+		return PTR_ERR(efivars_kset);
 	}
 
 	efivar_init(efivars_sysfs_callback, NULL, false,

index 97cdd16..df881b1 100644
@@ -113,8 +113,8 @@ add_sysfs_runtime_map_entry(struct kobject *kobj, int nr)
 
 	if (!map_kset) {
 		map_kset = kset_create_and_add("runtime-map", NULL, kobj);
-		if (!map_kset)
-			return ERR_PTR(-ENOMEM);
+		if (IS_ERR(map_kset))
+			return ERR_CAST(map_kset);
 	}
 
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);

index 17cf96c..23e40c9 100644
@@ -186,8 +186,8 @@ static int add_sysfs_fw_map_entry(struct firmware_map_entry *entry)
 
 	if (!mmap_kset) {
 		mmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
-		if (!mmap_kset)
-			return -ENOMEM;
+		if (IS_ERR(mmap_kset))
+			return PTR_ERR(mmap_kset);
 	}
 
 	entry->kobj.kset = mmap_kset;