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devip: fix arpread, dont return partial entries

--- a/sys/src/9/ip/arp.c

+++ b/sys/src/9/ip/arp.c

@@ -460,16 +460,17 @@

 		qunlock(arp);

 		runlock(ifc);

-		n = snprint(p, len, "%-6.6s %-4.4s %-40.40I %-16.16s %I\n",

+		n = snprint(up->genbuf, sizeof up->genbuf,

+			"%-6.6s %-4.4s %-40.40I %-16.16s %I\n",

 			mname, state, ip, mac, ia);

-		if(o < 0) {

-			if(n > -o)

-				memmove(p, p-o, n+o);

-			o += n;

-		} else {

-			len -= n;

-			p += n;

-		}

+		o += n;

+		if(o <= 0)

+			continue;

+		if(n > len)

+			break;

+		memmove(p, up->genbuf, n);

+		len -= n;

+		p += n;

 	}

 	return p - s;