Fix failed assertion

apps/openmw/mwinput/mousemanager.cpp

@@ -70,7 +70,6 @@ namespace MWInput
         mBindingsManager->mouseMoved(arg);
 
         MWBase::InputManager* input = MWBase::Environment::get().getInputManager();
-        MWBase::World* world = MWBase::Environment::get().getWorld();
         input->setJoystickLastUsed(false);
         input->resetIdleTime();
 
@@ -94,6 +93,8 @@ namespace MWInput
 
         if (mMouseLookEnabled && !input->controlsDisabled())
         {
+            MWBase::World* world = MWBase::Environment::get().getWorld();
+
             float x = arg.xrel * mCameraSensitivity * (mInvertX ? -1 : 1) / 256.f;
             float y = arg.yrel * mCameraSensitivity * (mInvertY ? -1 : 1) * mCameraYMultiplier / 256.f;
 
@@ -110,7 +111,7 @@ namespace MWInput
                 player.pitch(y);
             }
             else if (!input->getControlSwitch("playerlooking"))
-                world->disableDeferredPreviewRotation();
+                MWBase::Environment::get().getWorld()->disableDeferredPreviewRotation();
         }
     }