Change ap_get_brigade prototype to remove *readbytes in favor of readbytes.

If you need the length, you should be using apr_brigade_length.  This is
much more consistent.  Of all the places that call ap_get_brigade, only
one (ap_http_filter) needs the length.  This makes it now possible to
pass constants down without assigning them to a temporary variable first.

Also:
- Change proxy_ftp to use EXHAUSTIVE mode (didn't catch its -1 before)
- Fix buglet in mod_ssl that would cause it to return too much data in
  some circumstances


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93014 13f79535-47bb-0310-9956-ffa450edef68

modules/http/http_request.c

@@ -239,7 +239,6 @@ static void check_pipeline_flush(request_rec *r)
        ### allow us to defer creation of the brigade to when we actually
        ### need to send a FLUSH. */
     apr_bucket_brigade *bb = apr_brigade_create(r->pool);
-    apr_off_t zero = 0;
 
     /* Flush the filter contents if:
      *
@@ -250,7 +249,7 @@ static void check_pipeline_flush(request_rec *r)
     /* ### is zero correct? that means "read one line" */
     if (!r->connection->keepalive || 
         ap_get_brigade(r->input_filters, bb, AP_MODE_EATCRLF, 
-                       APR_NONBLOCK_READ, &zero) != APR_SUCCESS) {
+                       APR_NONBLOCK_READ, 0) != APR_SUCCESS) {
         apr_bucket *e = apr_bucket_flush_create();
 
         /* We just send directly to the connection based filters.  At