ACPI: delete acpi_os_free(), use kfree() directly

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 401e723..a05b3df 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -319,7 +319,7 @@
 		goto end;
 	}
 
-	acpi_os_free(buffer.pointer);
+	kfree(buffer.pointer);
 
 	device->wakeup.flags.valid = 1;
 	/* Power button, Lid switch always enable wakeup */
@@ -854,7 +854,7 @@
 			printk(KERN_ERR "Memory allocation error\n");
 	}
 
-	acpi_os_free(buffer.pointer);
+	kfree(buffer.pointer);
 }
 
 static int acpi_device_set_context(struct acpi_device *device, int type)