vrrp: fix segfault when instance has no interface configured #2513
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If a vrrp instance has no interface configured (so it is unicast), processing SIGUSR1 resulted ina segfault. Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>
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If a vrrp instance has no interface configured (so it is unicast), processing SIGUSR1 resulted in a segfault.