Add generated function for CUDNN in DFGraph header

hpvm/include/SupportHPVM/DFGraph.h

@@ -402,7 +402,7 @@ public:
       GenFuncInfo.gpu_hasCPUFunc = isCPUFunc;
       break;
     case hpvm::CUDNN_TARGET:
-      if (GenFuncs.GPUGenFunc != NULL) {
+      if (GenFuncs.CUDNNGenFunc != NULL) {
         DEBUG(errs() << "Warning: Second generated GPU function for node "
                      << FuncPointer->getName() << "\n");
       }