fixed coverity warning

ge/graph/load/model_manager/davinci_model.cc

@@ -2137,7 +2137,10 @@ void DavinciModel::GetModelAttr(vector<string> &out_shape_info) const {
 }
 
 void DavinciModel::SetInputDimsInfo(const vector<int64_t> &input_dims, Format &format, ShapeDescription &shape_info) {
-  uint32_t n, c, h, w;
+  uint32_t n;
+  uint32_t c;
+  uint32_t h;
+  uint32_t w;
   n = format == FORMAT_NHWC ? NHWC_DIM_N : NCHW_DIM_N;
   c = format == FORMAT_NHWC ? NHWC_DIM_C : NCHW_DIM_C;
   h = format == FORMAT_NHWC ? NHWC_DIM_H : NCHW_DIM_H;