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diff -up linuxptp-2.0/util.c.addreq linuxptp-2.0/util.c
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--- linuxptp-2.0/util.c.addreq	2019-03-25 11:43:55.878146767 +0100
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+++ linuxptp-2.0/util.c	2019-03-25 11:44:38.215244483 +0100
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@@ -78,7 +78,7 @@ int addreq(enum transport_type type, str
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 	case TRANS_UDP_IPV4:
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 		bufa = &a->sin.sin_addr;
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 		bufb = &b->sin.sin_addr;
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-		len = sizeof(a->sin);
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+		len = sizeof(a->sin.sin_addr);
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 		break;
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 	case TRANS_IEEE_802_3:
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 		bufa = &a->sll.sll_addr;