[PATCH] thermal: of-thermal: Fix setting of set_emul_temp hook

[Keerthy]

Currently thermal zone set_emul_temp is set unconditionally
with of_thermal_set_emul_temp function. Set this only if the
set_emul_temp hook is provided for thermal_zone_of_device_ops.

This fixes emul_temp failures on platforms for which set_emul_temp
hook is not populated.

Fixes: "184a4bf623f (thermal: of: Extend current
        of-thermal.c code to allow setting emulated temp)"
Suggested-by: Eduardo Valentin <edubez...@gmail.com>
Signed-off-by: Keerthy <j-keer...@ti.com>
---
 drivers/thermal/of-thermal.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index b8e509c..93d8ce0 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -181,9 +181,6 @@ static int of_thermal_set_emul_temp(struct 
thermal_zone_device *tz,
 {
        struct __thermal_zone *data = tz->devdata;
 
-       if (!data->ops || !data->ops->set_emul_temp)
-               return -EINVAL;
-
        return data->ops->set_emul_temp(data->sensor_data, temp);
 }
 
@@ -427,7 +424,9 @@ thermal_zone_of_add_sensor(struct device_node *zone,
 
        tzd->ops->get_temp = of_thermal_get_temp;
        tzd->ops->get_trend = of_thermal_get_trend;
-       tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
+       if (ops->set_emul_temp)
+               tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
+
        mutex_unlock(&tzd->lock);
 
        return tzd;
-- 
1.9.1