thermal: tegra: fix static checker warning

There has a static checker warning:
warn: variable dereferenced before check 'dev' (see line 222)

Since check 'dev' is unnecessary, so remove this check.

Fixes: ee6d79f202a4 ("thermal: tegra: add thermtrip function")
Signed-off-by: Wei Ni <wni@nvidia.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/tegra/soctherm.c

@@ -223,10 +223,7 @@ static int thermtrip_program(struct device *dev,
 	int temp;
 	u32 r;
 
-	if (!dev || !sg)
-		return -EINVAL;
-
-	if (!sg->thermtrip_threshold_mask)
+	if (!sg || !sg->thermtrip_threshold_mask)
 		return -EINVAL;
 
 	temp = enforce_temp_range(dev, trip_temp) / ts->soc->thresh_grain;