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ip/ipconfig: treat /32 mask as /0

some dhcp servers send a mask of 255.255.255.255 to indicate the gateway is directly routeable.

thanks to david du colombier for this patch.

--- a/sys/src/cmd/ip/ipconfig/main.c

+++ b/sys/src/cmd/ip/ipconfig/main.c

@@ -1233,6 +1233,8 @@

 		if(!validip(conf.mask) || !Oflag){

 			if(!optgetaddr(bp->optdata, OBmask, conf.mask))

 				ipmove(conf.mask, IPnoaddr);

+			if(ipcmp(conf.mask, IPv4bcast) == 0)

+				ipmove(conf.mask, IPnoaddr);

 		}

 		DEBUG("ipaddr=%I ipmask=%M ", conf.laddr, conf.mask);