check results of parseip.

Reference: /n/sources/patch/applied/ipinfochk
Date: Thu Apr 17 20:14:26 CES 2008
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libndb/ndbipinfo.c	Thu Apr 17 20:14:20 2008
+++ /sys/src/libndb/ndbipinfo.c	Thu Apr 17 20:14:18 2008
@@ -188,7 +188,10 @@
 		t = ndbnew("ip", val);
 		t->line = t;
 		t->entry = nil;
-		parseip(net, val);
+		if(parseip(net, val) == -1){
+			ndbfree(f);
+			return nil;
+		}
 	} else {
 		/* found one */
 		while(nt != nil){
@@ -196,7 +199,11 @@
 			t = ndbconcatenate(t, nt);
 			nt = ndbsnext(&s, attr, val);
 		}
-		parseip(net, ipstr);
+		if(parseip(net, ipstr) == -1){
+			free(ipstr);
+			ndbfree(f);
+			return nil;
+		}
 		free(ipstr);
 	}
 	ipmove(ip, net);