Code quality improvements for dsmr (#82443)

homeassistant/components/dsmr/sensor.py

@@ -559,6 +559,7 @@ class DSMREntity(SensorEntity):
     @property
     def native_value(self) -> StateType:
         """Return the state of sensor, if available, translate if needed."""
+        value: StateType
         if (value := self.get_dsmr_object_attr("value")) is None:
             return None
 
@@ -573,10 +574,7 @@ class DSMREntity(SensorEntity):
                 float(value), self._entry.data.get(CONF_PRECISION, DEFAULT_PRECISION)
             )
 
-        if value is not None:
-            return value
-
-        return None
+        return value
 
     @property
     def native_unit_of_measurement(self) -> str | None: