Make a function parameter const

apps/openmw/mwsound/soundmanager.cpp

@@ -258,7 +258,7 @@ namespace MWSound
         }
     }
 
-    void SoundManager::stopSound(MWWorld::Ptr::CellStore *cell)
+    void SoundManager::stopSound(const MWWorld::Ptr::CellStore *cell)
     {
         // Remove all references to objects belonging to a given cell
         SoundMap::iterator snditer = mActiveSounds.begin();

apps/openmw/mwsound/soundmanager.hpp

@@ -99,7 +99,7 @@ namespace MWSound
         ///< Stop the given object from playing the given sound, If no soundId is given,
         /// all sounds for this reference will stop.
 
-        void stopSound(MWWorld::Ptr::CellStore *cell);
+        void stopSound(const MWWorld::Ptr::CellStore *cell);
         ///< Stop all sounds for the given cell.
 
         void stopSound(const std::string& soundId);