ACPI / processor: Drop an unused argument of a cleanup routine

acpi_processor_unregister_performance() actually doesn't use its
first argument, so drop it and update the callers accordingly.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index cfc8aba..36b6da2 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -784,9 +784,7 @@
 
 EXPORT_SYMBOL(acpi_processor_register_performance);
 
-void
-acpi_processor_unregister_performance(struct acpi_processor_performance
-				      *performance, unsigned int cpu)
+void acpi_processor_unregister_performance(unsigned int cpu)
 {
 	struct acpi_processor *pr;