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diff -up dhcp-4.3.0a1/common/dispatch.c.dracut dhcp-4.3.0a1/common/dispatch.c
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--- dhcp-4.3.0a1/common/dispatch.c.dracut	2013-12-11 01:25:12.000000000 +0100
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+++ dhcp-4.3.0a1/common/dispatch.c	2013-12-19 15:39:50.350505860 +0100
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@@ -210,6 +210,10 @@ void add_timeout (when, where, what, ref
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 	isc_interval_t interval;
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 	isc_time_t expires;
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+	if (when == NULL) {
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+		return;
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+	}
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+
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 	/* See if this timeout supersedes an existing timeout. */
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 	t = (struct timeout *)0;
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 	for (q = timeouts; q; q = q->next) {