Two Object::copy calls less

poppler/Catalog.cc

@@ -252,8 +252,7 @@ bool Catalog::cachePageTree(int page)
 
     if (pagesList->empty()) return false;
 
-    Object pagesDict = pagesList->back().copy();
-    Object kids = pagesDict.dictLookup("Kids");
+    Object kids = pagesList->back().dictLookup("Kids");
     if (!kids.isArray()) {
       error(errSyntaxError, -1, "Kids object (page {0:uld}) is wrong type ({1:s})",
 	    pages.size()+1, kids.getTypeName());

poppler/Page.cc

@@ -170,9 +170,9 @@ PageAttrs::PageAttrs(PageAttrs *attrs, Dict *dict) {
   separationInfo = dict->lookup("SeparationInfo");
 
   // resource dictionary
-  obj1 = dict->lookup("Resources");
-  if (obj1.isDict()) {
-    resources = obj1.copy();
+  Object objResources = dict->lookup("Resources");
+  if (objResources.isDict()) {
+    resources = std::move(objResources);
   }
 }