Fix: Cycles HIP-RT crash

The crash has been introduced by the refactor of lights to be
objects in #134846.

We can make such cases easier to catch at compile time in the
future, but for now applying the minimal patch which solves the
problem without going deeper into refactor.

Pull Request: https://projects.blender.org/blender/blender/pulls/135570

intern/cycles/device/hiprt/device_impl.cpp

@@ -766,6 +766,9 @@ void HIPRTDevice::build_blas(BVHHIPRT *bvh, Geometry *geom, hiprtBuildOptions op
       break;
     }
 
+    case Geometry::LIGHT:
+      return;
+
     default:
       assert(geom_input.geomType != hiprtInvalidValue);
   }