Fixed suspicios if-expression

src/MissionManager/VisualMissionItem.cc

@@ -167,15 +167,11 @@ void VisualMissionItem::_updateTerrainAltitude(void)
         return;
     }
     if (!_flyView && specifiesCoordinate() && coordinate().isValid()) {
-        if (specifiesCoordinate()) {
-            if (coordinate().isValid()) {
         // We use a timer so that any additional requests before the timer fires result in only a single request
         _updateTerrainTimer.start();
-            }
     } else {
         _terrainAltitude = qQNaN();
     }
-    }
 }
 
 void VisualMissionItem::_reallyUpdateTerrainAltitude(void)