ACPICA: Fix broken call depth tracing logic.

This patch does not affect the generation of the Linux binary.
This patch decreases 26 lines of 20121018 divergence.diff.

The ACPICA uses a call depth tracing mechanism by wrapping the return
statements with return macros and marking the entrance with
ACPI_FUNCTION_TRACE_ macros. There are other ACPI_FUNCTION_ macros used
to mark the functions not using this tracing mechanism.

This patch fixes broken call depth tracing logic.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/nsxfeval.c

@@ -492,7 +492,7 @@ acpi_walk_namespace(acpi_object_type type,
 	 */
 	status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock);
 	if (ACPI_FAILURE(status)) {
-		return status;
+		return_ACPI_STATUS(status);
 	}
 
 	/*
@@ -550,7 +550,7 @@ acpi_ns_get_device_callback(acpi_handle obj_handle,
 
 	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
+		return (status);
 	}
 
 	node = acpi_ns_validate_handle(obj_handle);