ACPICA: Update dsmethod.c to get rid of unused variable warning

All the 3 major C compilers (MSVC, GCC, LLVM/Clang) warn about
the unused variable i after the removal of its usage by PR #1031
addressing Issue #1027

Link: acpica/acpica@6d235320
Signed-off-by: Saket Dumbre <saket.dumbre@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: SaketADumbre

drivers/acpi/acpica/dsmethod.c

@@ -462,7 +462,6 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 	struct acpi_walk_state *next_walk_state = NULL;
 	union acpi_operand_object *obj_desc;
 	struct acpi_evaluate_info *info;
-	u32 i;
 
 	ACPI_FUNCTION_TRACE_PTR(ds_call_control_method, this_walk_state);