ACPI:Fix goto flows in thermal-sys

This patch fixes two minor bugs in thermal_sys:
(a) The flow of goto's in thermal_hwmon_add_sysfs.
(b) Remove the temp*_crit only if there is a get_crit_temp defined, in
    thermal_remove_hwmon_sysfs.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>