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

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index afd937b..c68b1bb 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -147,13 +147,6 @@
 		return kmalloc(size, GFP_KERNEL);
 }
 
-void acpi_os_free(void *ptr)
-{
-	kfree(ptr);
-}
-
-EXPORT_SYMBOL(acpi_os_free);
-
 acpi_status acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
 {
 	if (efi_enabled) {
@@ -743,7 +736,7 @@
 
 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
 
-	acpi_os_free(sem);
+	kfree(sem);
 	sem = NULL;
 
 	return AE_OK;