[IPV4]: Incorrect permissions on route flush sysctl

This has been brought up before.. http://lkml.org/lkml/2000/1/21/116
but didnt seem to get resolved.  This morning I got someone
file a bugzilla about it breaking sysctl(8).
Signed-off-by: NDave Jones <davej@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/route.c

@@ -2843,7 +2843,7 @@ ctl_table ipv4_route_table[] = {
 		.procname	= "flush",
 		.data		= &flush_delay,
 		.maxlen		= sizeof(int),
-		.mode		= 0644,
+		.mode		= 0200,
 		.proc_handler	= &ipv4_sysctl_rtcache_flush,
 		.strategy	= &ipv4_sysctl_rtcache_flush_strategy,
 	},