message: Improve error message when CUPTI could not be loaded.
diff: @@ -5,7 +5,12 @@ CUptiResult CUPTIAPI cuptiGetResultString(CUptiResult result,
  const char** str) {
  using FuncPtr = CUptiResult(CUPTIAPI*)(CUptiResult, const char**);
  static auto func_ptr = LoadSymbol<FuncPtr>("cuptiGetResultString");
  - if (!func_ptr) return GetSymbolNotFoundError();
  + if (!func_ptr) {
  + if (str) {
  + *str = "CUPTI could not be loaded or symbol could not be found.";
  + }
  + return GetSymbolNotFoundError();
  + }
  return func_ptr(result, str);
  }
  