File dead-loop-fix.patch of Package ntrack

Cherry pick from upstream (lp:ntrack rev 312)
Index: ntrack-011/modules/ntrack-libnl.c
===================================================================
--- ntrack-011.orig/modules/ntrack-libnl.c	2011-05-17 11:40:35.349643551 -0400
+++ ntrack-011/modules/ntrack-libnl.c	2011-05-17 11:40:42.221643551 -0400
@@ -384,6 +384,9 @@
 		if (rtnl_link_get_ifindex(link) > iindex)
 			break;
 		i = i->next;
+
+		if (i == linklist)
+			break;
 	}
 	return result;
 }