Fix minor type issue in Content-Length parsing.
Fix minor type issue in Content-Length parsing.

* buckets/response_buckets.c
  (run_machine): Set length to apr_uint64_t.


git-svn-id: 683495cb1553624b05a54e2ba9533425f69cf277@1205 61a7d7f5-40b7-0310-9c16-bb0ea8cb1845

coapp-packages/serf,coapp-packages/serf,coapp-packages/serf