Fix broken while () {} loops (lingering code from the old logic),

  Fix broken while () {} loops (lingering code from the old logic),
  closes an infinite loop in the most recent version.  Init the cl_val
  to prevent failure of zero length bodies in the most recent version.

  Use 'request body' instead of 'data' to describe any errors.

  Finally, loop around ap_get_brigade to grab multiple chunks that still
  fall below our MAX_MEM_SPOOL threshold, since the chunk decoding from
  the client will pass up just one small chunk per ap_get_brigade call.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@219430 13f79535-47bb-0310-9956-ffa450edef68