ACPICA: Fix warnings from PR #295 merge

Possible loss of data from u32 to u8 conversions.

ACPICA commit 1d7a0aa04793ff731da13f2070877ec7a9498571

Link: acpica/acpica@1d7a0aa0
Signed-off-by: Saket Dumbre <saket.dumbre@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/2304653.iZASKD2KPV@rjwysocki.net

Author: SaketADumbre

drivers/acpi/acpica/dsutils.c

@@ -723,11 +723,11 @@ acpi_ds_create_operands(struct acpi_walk_state *walk_state,
 	 * pop everything off of the operand stack and delete those
 	 * objects
 	 */
-	walk_state->num_operands = i;
+	walk_state->num_operands = (u8)(i);
 	acpi_ds_obj_stack_pop_and_delete(new_num_operands, walk_state);
 
 	/* Restore operand count */
-	walk_state->num_operands = prev_num_operands;
+	walk_state->num_operands = (u8)(prev_num_operands);
 
 	ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %u", index));
 	return_ACPI_STATUS(status);