handle error path where ap_set_keepalive() will set keepalive to 0

to note a "to be closed" connection, and thus avoid reading
in a body when not needed.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@103539 13f79535-47bb-0310-9956-ffa450edef68