Don't set an underwater environment when there's no water

apps/openmw/mwsound/soundmanager.cpp

@@ -407,7 +407,7 @@ namespace MWSound
         if(!isMusicPlaying())
             startRandomTitle();
 
-        MWWorld::Ptr::CellStore *current = mEnvironment.mWorld->getPlayer().getPlayer().getCell();
+        const ESM::Cell *cell = mEnvironment.mWorld->getPlayer().getPlayer().getCell()->cell;
         Ogre::Camera *cam = mEnvironment.mWorld->getPlayer().getRenderer()->getCamera();
         Ogre::Vector3 nPos, nDir, nUp;
         nPos = cam->getRealPosition();
@@ -415,7 +415,7 @@ namespace MWSound
         nUp  = cam->getRealUp();
 
         Environment env = Env_Normal;
-        if(nPos.y < current->cell->water)
+        if((cell->data.flags&cell->HasWater) && nPos.y < cell->water)
             env = Env_Underwater;
 
         // The output handler is expecting vectors oriented like the game