fix onehot converter parser axis bug

mindspore/lite/src/runtime/kernel/arm/fp32/one_hot.cc

@@ -179,7 +179,7 @@ kernel::LiteKernel *CpuOneHotFp32KernelCreator(const std::vector<lite::tensor::T
                                                OpParameter *opParameter, const lite::Context *ctx,
                                                const kernel::KernelKey &desc,
                                                const mindspore::lite::PrimitiveC *primitive) {
-  if (opParameter != nullptr) {
+  if (opParameter == nullptr) {
     MS_LOG(ERROR) << "OneHot opParameter nullptr.";
     return nullptr;
   }

mindspore/lite/tools/converter/parser/tflite/tflite_one_hot_parser.cc

@@ -56,10 +56,6 @@ STATUS TfliteOneHotParser::Parse(const std::unique_ptr<tflite::OperatorT> &tflit
     MS_LOG(ERROR) << "tensor is null";
     return RET_NULL_PTR;
   }
-  const auto tensor_shape = tensor->shape;
-  if (axis < 0) {
-    axis += tensor_shape.size();
-  }
   attr->axis = axis;
 
   op->primitive->value.type = schema::PrimitiveType_OneHot;