CPDF_Document::LoadPattern() and friends always have a valid matrix.

core/fpdfapi/fpdf_page/cpdf_tilingpattern.cpp

Index: core/fpdfapi/fpdf_page/cpdf_tilingpattern.cpp
diff --git a/core/fpdfapi/fpdf_page/cpdf_tilingpattern.cpp b/core/fpdfapi/fpdf_page/cpdf_tilingpattern.cpp
index 3ace57063c24c9a783bbeea279ceae8b4f04c59a..0b1eeab9f4cb829ad1b3b82eb497d05df5031978 100644
--- a/core/fpdfapi/fpdf_page/cpdf_tilingpattern.cpp
+++ b/core/fpdfapi/fpdf_page/cpdf_tilingpattern.cpp
@@ -13,13 +13,12 @@
 
 CPDF_TilingPattern::CPDF_TilingPattern(CPDF_Document* pDoc,
                                        CPDF_Object* pPatternObj,
-                                       const CFX_Matrix* parentMatrix)
+                                       const CFX_Matrix& parentMatrix)
     : CPDF_Pattern(TILING, pDoc, pPatternObj, parentMatrix) {
   CPDF_Dictionary* pDict = m_pPatternObj->GetDict();
   m_Pattern2Form = pDict->GetMatrixBy("Matrix");
   m_bColored = pDict->GetIntegerBy("PaintType") == 1;
-  if (parentMatrix)
-    m_Pattern2Form.Concat(*parentMatrix);
+  m_Pattern2Form.Concat(parentMatrix);
 }
 
 CPDF_TilingPattern::~CPDF_TilingPattern() {