Make CPDF_ImageObject::m_Matrix private.

core/fpdfapi/render/fpdf_render_image.cpp

Index: core/fpdfapi/render/fpdf_render_image.cpp
diff --git a/core/fpdfapi/render/fpdf_render_image.cpp b/core/fpdfapi/render/fpdf_render_image.cpp
index cf5f97bab8a91f599bfcc2accb820a16ef89d510..b95828c0ccc013a833720ced2af99c02b923877b 100644
--- a/core/fpdfapi/render/fpdf_render_image.cpp
+++ b/core/fpdfapi/render/fpdf_render_image.cpp
@@ -378,11 +378,10 @@ bool CPDF_ImageRenderer::Start(CPDF_RenderStatus* pStatus,
       !m_pRenderStatus->m_Options.m_pOCContext->CheckOCGVisible(pOC)) {
     return false;
   }
-  m_ImageMatrix = m_pImageObject->m_Matrix;
+  m_ImageMatrix = m_pImageObject->matrix();
   m_ImageMatrix.Concat(*pObj2Device);
-  if (StartLoadDIBSource()) {
+  if (StartLoadDIBSource())
     return true;
-  }
   return StartRenderDIBSource();
 }