Prevent cobbering of lenght for subsequent sends. Still not quite

right; we ough to call apr_send again if len != requested_len - but
then our timeout could be len * timeout if we happen to only stuff
one byte down the pipe each time.

PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88625 13f79535-47bb-0310-9956-ffa450edef68