message: Fix: correct typos in prepare_tf.cc
diff: @@ -179,8 +179,9 @@ struct InsertTFLQuantOpsAfterTFFakeQuantOp
  PatternRewriter &rewriter) const override {
  // We don't want to insert quantize/dequantize if the quantize op exists.
  auto res = tf_op.outputs();
  - if (!res.hasOneUse() || isa<QuantizeOp>(*res.user_begin()))
  + if (!res.hasOneUse() || isa<QuantizeOp>(*res.user_begin())) {
  return failure();
  + }
  // Extract the min/max constant values from the operands. We also consider
  // a special case that there are tf.Identity ops between the min/max
  @@ -188,7 +189,7 @@ struct InsertTFLQuantOpsAfterTFFakeQuantOp
  FetchAttrType min_value, max_value;
  if (!fetchMinMax(tf_op, min_value, max_value)) {
  - return this->failure();
  + return failure();
  }
  int quant_dim = -1;
  @@ -206,7 +207,9 @@ struct InsertTFLQuantOpsAfterTFFakeQuantOp
  TypeAttr qtype = quant::GetQuantizedTypeAttr(
  rewriter, res_type, min_value, max_value, quant_dim, num_bits,
  narrow_range, /*is_signed=*/false);
  - if (!qtype) failure();
  + if (!qtype) {
  + return failure();
  + }
  // Finally, use the quantization parameter to create the quantize and
  // dequantize ops, and insert them between the tf.FakeQuantWithMinMaxVarsOp
  