use vtkNew to alloc the points and polys

IO/Geometry/vtkSTLReader.cxx

@@ -23,6 +23,7 @@
 #include "vtkInformation.h"
 #include "vtkInformationVector.h"
 #include "vtkMergePoints.h"
+#include "vtkNew.h"
 #include "vtkObjectFactory.h"
 #include "vtkPolyData.h"
 #include "vtkSmartPointer.h"
@@ -108,8 +109,8 @@ int vtkSTLReader::RequestData(
     return 0;
   }
 
-  vtkPoints *newPts = vtkPoints::New();
-  vtkCellArray *newPolys = vtkCellArray::New();
+  vtkNew<vtkPoints> newPts;
+  vtkNew<vtkCellArray> newPolys;
   vtkFloatArray *newScalars = nullptr;
 
   // Depending upon file type, read differently
@@ -122,11 +123,9 @@ int vtkSTLReader::RequestData(
       newScalars = vtkFloatArray::New();
       newScalars->Allocate(5000);
     }
-    if (!this->ReadASCIISTL(fp, newPts, newPolys, newScalars))
+    if (!this->ReadASCIISTL(fp, newPts.Get(), newPolys.Get(), newScalars))
     {
       fclose(fp);
-      newPts->Delete();
-      newPolys->Delete();
       if(newScalars)
       {
         newScalars->Delete();
@@ -143,8 +142,6 @@ int vtkSTLReader::RequestData(
     {
       vtkErrorMacro(<< "File " << this->FileName << " not found");
       this->SetErrorCode(vtkErrorCode::CannotOpenFileError);
-      newPts->Delete();
-      newPolys->Delete();
       if(newScalars)
       {
         newScalars->Delete();
@@ -152,11 +149,9 @@ int vtkSTLReader::RequestData(
       return 0;
     }
 
-    if (!this->ReadBinarySTL(fp, newPts, newPolys))
+    if (!this->ReadBinarySTL(fp, newPts.Get(), newPolys.Get()))
     {
       fclose(fp);
-      newPts->Delete();
-      newPolys->Delete();
       if(newScalars)
       {
         newScalars->Delete();
@@ -172,8 +167,8 @@ int vtkSTLReader::RequestData(
   fclose(fp);
 
   // If merging is on, create hash table and merge points/triangles.
-  vtkPoints *mergedPts = newPts;
-  vtkCellArray *mergedPolys = newPolys;
+  vtkPoints *mergedPts = newPts.Get();
+  vtkCellArray *mergedPolys = newPolys.Get();
   vtkFloatArray *mergedScalars = newScalars;
   if (this->Merging)
   {
@@ -220,8 +215,6 @@ int vtkSTLReader::RequestData(
       nextCell++;
     }
 
-    newPts->Delete();
-    newPolys->Delete();
     if (newScalars)
     {
       newScalars->Delete();