http_filter():

  get rid of an unnecessary condition where we set ctx->b to NULL;
  it was already NULL

ap_get_client_block():
  "fix" the pool for the brigade used by ap_get_client_block() to
  save its state; this allows pipelined requests to work


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86630 13f79535-47bb-0310-9956-ffa450edef68