ACPICA: Fix for invalid large array index on 64-bit systems

This problem was introduced in 20080514 as a result of the
elimination of the acpi_native_uint type. Code uses a negative
array index, which should be eliminated.
Signed-off-by: NBob Moore <robert.moore@intel.com>
Signed-off-by: NLin Ming <ming.m.lin@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>

drivers/acpi/executer/exdump.c

@@ -776,7 +776,7 @@ acpi_ex_dump_operands(union acpi_operand_object **operands,
 		      const char *note,
 		      const char *module_name, u32 line_number)
 {
-	u32 i;
+	s32 i;
 
 	ACPI_FUNCTION_NAME(ex_dump_operands);