Merge branch 'blender-v2.82-release'

intern/cycles/device/device_optix.cpp

@@ -1432,6 +1432,8 @@ class OptiXDevice : public Device {
           size_t motion_transform_size = sizeof(OptixSRTMotionTransform) +
                                          motion_keys * sizeof(OptixSRTData);
 
+          const CUDAContextScope scope(cuda_context);
+
           CUdeviceptr motion_transform_gpu = 0;
           check_result_cuda_ret(cuMemAlloc(&motion_transform_gpu, motion_transform_size));
           as_mem.push_back(motion_transform_gpu);