ACPI / sleep: Drop redundant acpi_disabled check

acpi_sleep_init() is only called from acpi_bus_init() and the
code logic shows that it doesn't need to check acpi_disabled:

acpi_init();
	if (acpi_disabled) return;
	acpi_bus_init();
		acpi_sleep_init();
			if (acpi_disabled)
				return 0;
Signed-off-by: NHanjun Guo <hanjun.guo@linaro.org>
[rjw: Subject and changelog]
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/sleep.c

@@ -802,9 +802,6 @@ int __init acpi_sleep_init(void)
 	char *pos = supported;
 	int i;
 
-	if (acpi_disabled)
-		return 0;
-
 	acpi_sleep_dmi_check();
 
 	sleep_states[ACPI_STATE_S0] = 1;