Avoid compiler warning

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac454@4077 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/datasrc/memory_datasrc.cc

@@ -160,7 +160,7 @@ struct MemoryZone::MemoryZoneImpl {
     // Implementation of MemoryZone::find
     FindResult find(const Name& name, RRType type) const {
         // Get the node
-        DomainNode* node;
+        DomainNode* node(NULL);
         FindState state;
         switch (domains_.find(name, &node, zonecutCallback, &state)) {
             case DomainTree::PARTIALMATCH: