Avoid unused variable warnings on Linux

xfa/fxfa/parser/xfa_object_imp.cpp

Index: xfa/fxfa/parser/xfa_object_imp.cpp
diff --git a/xfa/fxfa/parser/xfa_object_imp.cpp b/xfa/fxfa/parser/xfa_object_imp.cpp
index 91497a50d02a95b262e172966e11f3ce7d8a3734..dd5e1b4591ffa49c3a036ca76236db536e8ff439 100644
--- a/xfa/fxfa/parser/xfa_object_imp.cpp
+++ b/xfa/fxfa/parser/xfa_object_imp.cpp
@@ -4576,6 +4576,7 @@ int32_t CXFA_Node::InsertChild(int32_t index, CXFA_Node* pNode) {
   pNode->m_pParent = this;
   FX_BOOL ret = m_pDocument->RemovePurgeNode(pNode);
   ASSERT(ret);
+  (void)ret;  // Avoid unused variable warning.
 
   if (m_pChild == NULL || index == 0) {
     if (index > 0) {
@@ -4625,6 +4626,7 @@ FX_BOOL CXFA_Node::InsertChild(CXFA_Node* pNode, CXFA_Node* pBeforeNode) {
   }
   FX_BOOL ret = m_pDocument->RemovePurgeNode(pNode);
   ASSERT(ret);
+  (void)ret;  // Avoid unused variable warning.
 
   int32_t nIndex = -1;
   pNode->m_pParent = this;