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ip/dhcpd: ignore ipv6 addresses when looking up static binding

--- a/sys/src/cmd/ip/dhcpd/ndb.c

+++ b/sys/src/cmd/ip/dhcpd/ndb.c

@@ -248,9 +248,11 @@

 		for(nt = t; nt != nil; nt = nt->entry){

 			if(strcmp(nt->attr, "ip") != 0)

 				continue;

-			if(parseip(ciaddr, nt->val) == -1)

+			if(parseip(ciaddr, nt->val) == -1 || !isv4(ciaddr))

 				continue;

-			if(!validip(ciaddr) || !samenet(ciaddr, riip))

+			if(!validip(ciaddr))

+				continue;

+			if(!samenet(ciaddr, riip))

 				continue;

 			if(lookupip(ciaddr, hwattr, hwval, iip, 0) < 0)

 				continue;