Follow up to r1611193: update the inserted node's top while looping should we
have to create more than one top node (eg. preheight > 0).

(the check on p != NULL can be omited since it can't be here).


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1611466 13f79535-47bb-0310-9956-ffa450edef68