ACPICA: Fix warning for 64-bit build

Fixes warning from exconfig.c on 64-bit build.

AK: This actually was fixed earlier in Linux, this just syncs with
AK: the version of the fix that went into the ACPCA codebase
Signed-off-by: NBob Moore <robert.moore@intel.com>
Signed-off-by: NLin Ming <ming.m.lin@intel.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

drivers/acpi/executer/exconfig.c

@@ -96,8 +96,7 @@ acpi_ex_add_table(u32 table_index,
 
 	/* Install the new table into the local data structures */
 
-	obj_desc->reference.object = ACPI_CAST_PTR(void,
-			(unsigned long)table_index);
+	obj_desc->reference.object = ACPI_TO_POINTER(table_index);
 
 	/* Add the table to the namespace */