When forcing clear page data, no need to release colorspace when releasing pattern

core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
index 131edbe9b59febd639195bec1ed83c0bca7adb8a..77db4534fbd27f345ede1a73f9cb5ce3bbaea08e 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
@@ -229,6 +229,7 @@ void CPDF_DocPageData::Clear(FX_BOOL bForceRelease)
         m_PatternMap.GetNextAssoc(pos, ptObj, ptData);
         nCount = ptData->m_nCount;
         if (bForceRelease || nCount < 2) {
+            ptData->m_Obj->SetForceClear(bForceRelease);

[jun_fang, 2014/09/16 19:24:38]

Check whether ptData->m_Obj is not NULL?

             delete ptData->m_Obj;
             ptData->m_Obj = NULL;
         }