[varnishcache/varnish-cache] 180821: Make VSB_bcat() take a ssize_t to be able to asser...

[Poul-Henning Kamp]

  Branch: refs/heads/master
  Home:   https://github.com/varnishcache/varnish-cache
  Commit: 18082164c232735abbff81ec9a24233a23f4cda6
      https://github.com/varnishcache/varnish-cache/commit/18082164c232735abbff81ec9a24233a23f4cda6
  Author: Poul-Henning Kamp <phk at FreeBSD.org>
  Date:   2015-12-15 (Tue, 15 Dec 2015)

  Changed paths:
    M include/vsb.h
    M lib/libvarnish/vsb.c

  Log Message:
  -----------
  Make VSB_bcat() take a ssize_t to be able to assert non-negative lengths.

Spotted by:	FlexeLint