Fix compilation

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/vorner-recursor-dummylog@3570 e5f2f494-b856-4b98-b285-d166d9295462

src/bin/recurse/recursor.cc

@@ -554,7 +554,7 @@ Recursor::setListenAddresses(const vector<addr_t>& addresses) {
             setAddresses(dnss_, impl_->listen_);
         }
         catch (const exception& e2) {
-            dlog("Unable to recover from error: " + e.what() +
+            dlog(string("Unable to recover from error: ") + e.what() +
                 "Rollback failed with: " + e2.what());
             abort();
         }