Memory allocation problem in push_array() -- it would corrupt memory

when nalloc==0.

Submitted: Kai Risku <krisku@tf.hut.fi> and Roy Fielding
Reviewed: Dean, Randy, Chuck


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77716 13f79535-47bb-0310-9956-ffa450edef68