Fixes #1887: Equipped items do not emit sounds

Corrected wrong return type of Class::getSound() method.

Signed-off-by: Lukasz Gromanowski <lgromanowski@gmail.com>

apps/openmw/mwclass/light.cpp

@@ -298,7 +298,7 @@ namespace MWClass
         state2.mTime = dynamic_cast<LightCustomData&> (*ptr.getRefData().getCustomData()).mTime;
     }
 
-    const std::string& Light::getSound(const MWWorld::Ptr& ptr) const
+    std::string Light::getSound(const MWWorld::Ptr& ptr) const
     {
       return ptr.get<ESM::Light>()->mBase->mSound;
     }

apps/openmw/mwclass/light.hpp

@@ -83,7 +83,7 @@ namespace MWClass
                 const;
             ///< Write additional state from \a ptr into \a state.
 
-            virtual const std::string& getSound(const MWWorld::Ptr& ptr) const;
+            virtual std::string getSound(const MWWorld::Ptr& ptr) const;
     };
 }
 

apps/openmw/mwworld/class.cpp

@@ -421,7 +421,7 @@ namespace MWWorld
         throw std::runtime_error("this is not a door");
     }
 
-    const std::string& Class::getSound(const MWWorld::Ptr&) const
+    std::string Class::getSound(const MWWorld::Ptr&) const
     {
       return std::string();
     }

apps/openmw/mwworld/class.hpp

@@ -338,7 +338,7 @@ namespace MWWorld
             virtual void restock (const MWWorld::Ptr& ptr) const {}
 
             /// Returns sound id
-            virtual const std::string& getSound(const MWWorld::Ptr& ptr) const;
+            virtual std::string getSound(const MWWorld::Ptr& ptr) const;
     };
 }