ACPI: processor: Remove initialization of static variable

Address the following checkpatch error:

ERROR: do not initialise statics to false

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/processor_perflib.c

@@ -459,7 +459,7 @@ int acpi_processor_pstate_control(void)
 
 int acpi_processor_notify_smm(struct module *calling_module)
 {
-	static int is_done = 0;
+	static int is_done;
 	int result;
 
 	if (!acpi_processor_cpufreq_init)