[Varnish] #1813: Duplicate -a leads to assert instead of error message.

[Varnish]

#1813: Duplicate -a leads to assert instead of error message.
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 Reporter:  lkarsten  |       Owner:
     Type:  defect    |      Status:  new
 Priority:  normal    |   Milestone:
Component:  varnishd  |     Version:  4.1.0
 Severity:  normal    |  Resolution:
 Keywords:            |
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Comment (by lkarsten):

 {{{
 [11:26:07] < phk> scn, re #1813 what kind of -a argument do you use that
 the arg-check doesn't catch it ?
 [11:26:16] < phk> critter phk> ./varnishd -a :8080 -a :8080 -d
 [11:26:16] < phk> Error: Cannot open socket: :8080: Address already in use
 [11:27:27] < scn> varnish  15719     1  1 11:22 ?        00:00:00
 /usr/sbin/varnishd -a :80 -P /var/run/varnish.pid -f
 /etc/varnish/default.vcl -a :80
 [11:28:05] < scn> at some point i added -a :80 before -P in the systemd
 service file
 [11:28:39] < scn> due to dropping of privs before/after writing the
 pidfile. i don't remember the details.
 [11:28:45] < phk> scn, this must be some linuxy thing that allows you to
 bind twice...
 [11:29:27] < scn> this line was from ps way up in my scrollback buffer, it
 would be longer. there is a PROXY listener as well.
 }}}

 todo: reproduce on linux.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1813#comment:2>
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