!4827 [MS][LITE][BUG]set bias to zero

Merge pull request !4827 from fuzhiye/tmp

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

@@ -68,6 +68,7 @@ int ConvolutionCPUKernel::InitWeightBias() {
     MS_LOG(ERROR) << "malloc bias failed.";
     return RET_ERROR;
   }
+  memset(bias_data_, 0, oc_block_num * oc_block * sizeof(float));
 
   if (in_tensors_.size() == kInputSize2) {
     auto ori_bias = reinterpret_cast<float *>(in_tensors_.at(kBiasIndex)->Data());

mindspore/lite/src/runtime/kernel/arm/int8/convolution_int8.cc

@@ -297,7 +297,7 @@ int ConvolutionInt8CPUKernel::ReSize() {
     MS_LOG(ERROR) << "ConvolutionBase init failed.";
     return RET_ERROR;
   }
-  /*=============================nhwc4_input_============================*/
+
   int ic4 = UP_DIV(conv_param_->input_channel_, C4NUM);
   size_t nhwc4_input_size = ic4 * C4NUM * conv_param_->input_batch_ * conv_param_->input_h_ * conv_param_->input_w_;
   nhwc4_input_ = malloc(nhwc4_input_size);