Fix some minor resource leaks

Author: mgreter

src/ast.cpp

@@ -961,13 +961,13 @@ namespace Sass {
 
     // do some magic we inherit from node and extend
     Node node = subweave(lhsNode, rhsNode);
-    Selector_List_Ptr result = SASS_MEMORY_NEW(Selector_List, pstate());
+    Selector_List_Obj result = SASS_MEMORY_NEW(Selector_List, pstate());
     NodeDequePtr col = node.collection(); // move from collection to list
     for (NodeDeque::iterator it = col->begin(), end = col->end(); it != end; it++)
     { result->append(nodeToComplexSelector(Node::naiveTrim(*it))); }
 
     // only return if list has some entries
-    return result->length() ? result : 0;
+    return result->length() ? result.detach() : 0;
 
   }
 

src/parser.cpp

@@ -689,7 +689,7 @@ namespace Sass {
   Complex_Selector_Obj Parser::parse_complex_selector(bool chroot)
   {
 
-    String_Ptr reference = 0;
+    String_Obj reference = 0;
     lex < block_comment >();
     advanceToNextToken();
     Complex_Selector_Obj sel = SASS_MEMORY_NEW(Complex_Selector, pstate);
@@ -911,8 +911,8 @@ namespace Sass {
           >()
       ) {
         lex_css< alternatives < static_value, binomial > >();
-        String_Constant_Ptr expr = SASS_MEMORY_NEW(String_Constant, pstate, lexed);
-        if (expr && lex_css< exactly<')'> >()) {
+        String_Constant_Obj expr = SASS_MEMORY_NEW(String_Constant, pstate, lexed);
+        if (lex_css< exactly<')'> >()) {
           expr->can_compress_whitespace(true);
           return SASS_MEMORY_NEW(Pseudo_Selector, p, name, expr);
         }

src/source_map.cpp

@@ -54,15 +54,14 @@ namespace Sass {
     }
     json_append_member(json_srcmap, "sources", json_sources);
 
-    if (include_sources) {
+    if (include_sources && source_index.size()) {
       JsonNode *json_contents = json_mkarray();
       for (size_t i = 0; i < source_index.size(); ++i) {
         const Resource& resource(sources[source_index[i]]);
         JsonNode *json_content = json_mkstring(resource.contents);
         json_append_element(json_contents, json_content);
       }
-      if (json_contents->children.head)
-        json_append_member(json_srcmap, "sourcesContent", json_contents);
+      json_append_member(json_srcmap, "sourcesContent", json_contents);
     }
 
     JsonNode *json_names = json_mkarray();