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diff -up ./arpwatch.c.iinval ./arpwatch.c
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--- ./arpwatch.c.iinval	2012-10-15 16:55:58.646218256 +0200
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+++ ./arpwatch.c	2012-10-15 17:04:30.566199946 +0200
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@@ -171,7 +171,7 @@ try_dev(char *interface, pcap_t **pd, in
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 	timeout = 1000;
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 	*pd = pcap_open_live(interface, snaplen, 1, timeout, errbuf);
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-	if (NULL == pd) {
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+	if (NULL == *pd) {
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 		syslog(LOG_ERR, "pcap open %s: %s", interface,  errbuf);
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 		return NULL;
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 	}