CudaBadAlloc should clear the CUDA error in the constructor

struct CudaBadAlloc

   : public std::bad_alloc

{

   CudaBadAlloc()

   {

#ifdef HAVE_CUDA

      // Make sure to clear the CUDA error, otherwise the exception handler

      // might throw another exception with the same error.

      cudaGetLastError();

#endif

   }

   const char* what() const throw()

   {

      return "Failed to allocate memory on the CUDA device: "