Perform a minor clean up

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

             }
 
             // Warning: (resolutionChanged == false) if you open a new Editor tab of the same size!
-            m_VolumetricLightingModule.ResizeVBuffer(hdCamera.GetViewID(), texWidth, texHeight);
+            m_VolumetricLightingModule.ResizeVBuffer(hdCamera, texWidth, texHeight);
 
             // update recorded window resolution
             m_CurrentWidth = texWidth;

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Volumetrics/VolumetricLighting.cs

             return lightingRTID[1 + ((Time.renderedFrameCount + 1) & 1)];
         }
 
-        // n = number of buffers within the VBuffer
         public void Create(int viewID, int w, int h, int d)
         {
             Debug.Assert(viewID >= 0);
     {
         if (preset == VolumetricLightingPreset.Off) return;
 
-        CoreUtils.Destroy(m_VolumetricLightingCS);
+        m_VolumetricLightingCS = null;
 
         for (int i = 0, n = m_VBuffers.Count; i < n; i++)
         {
         m_VBuffers = null;
     }
 
-    public void ResizeVBuffer(int viewID, int screenWidth, int screenHeight)
+    public void ResizeVBuffer(HDCamera camera, int screenWidth, int screenHeight)
+        int viewID = camera.GetViewID();
+
         Debug.Assert(viewID >= 0);
 
         if (preset == VolumetricLightingPreset.Off) return;