[Bug 202959] Fix net/pimd build with clang 3.7.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202959

--- Comment #3 from olivier at cochard.me ---
(In reply to Hiroki Sato from comment #2)

My multicast virtual lab didn't works once I've upgraded pimd to 2.3.0.
My virtual lab detail:
http://bsdrp.net/documentation/examples/multicast_with_pim-sm

Once pimd started on the multicast router (R2 and R3), when R4 ask for joining
a mcast group:

[root at R4]~# mtest
multicast membership test program; enter ? for list of commands
j 239.1.1.1 em2 10.0.12.1
ok

R3 correctly received the join request:
[root at R3]~# tcpdump -ni em2 -vv
tcpdump: listening on em2, link-type EN10MB (Ethernet), capture size 65535 
    10.0.34.4 > 224.0.0.22: igmp v3 report, 1 group record(s) [gaddr 239.1.1.1
to_in { 10.0.12.1 }]
22:41:02.438726 IP (tos 0xc0, ttl 1, id 741, offset 0, flags [DF], proto IGMP
(2), length 44, options (RA))
    10.0.34.4 > 224.0.0.22: igmp v3 report, 1 group record(s) [gaddr 239.1.1.1
to_in { 10.0.12.1 }]

But it didn't update its mcast table anymore by showing a new mcast subscriber
:-(

[root at R3]~# pimd -r
Virtual Interface Table ======================================================
Vif  Local Address    Subnet              Thresh  Flags      Neighbors
---  ---------------  ------------------  ------  ---------  -----------------
  0  10.0.23.3        10.0.23/24               1  DR PIM     10.0.23.2
  1  10.0.34.3        10.0.34/24               1  DR NO-NBR
  2  10.0.23.3        register_vif0            1

 Vif  SSM Group        Sources

Multicast Routing Table ======================================================
--------------------------------- (*,*,G) ------------------------------------
Number of Groups: 0
Number of Cache MIRRORs: 0
------------------------------------------------------------------------------



Because iperf is igmpv2 only, I've tried with mcastread, but same behavior:


[root at R4]~# mcastread -v4 -s 10.0.12.1 em2 239.1.1.1 9090
mcastread: trying 239.1.1.1
mcastread: using (S,G)=(10.0.12.1,239.1.1.1)

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