[NETNS][DST] dst: pass the dst_ops as parameter to the gc functions

The garbage collection function receive the dst_ops structure as
parameter. This is useful for the next incoming patchset because it
will need the dst_ops (there will be several instances) and the
network namespace pointer (contained in the dst_ops).

The protocols which do not take care of the namespaces will not be
impacted by this change (expect for the function signature), they do
just ignore the parameter.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 938ba7d..31be29b 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -107,7 +107,7 @@
 
 static unsigned long dn_rt_deadline;
 
-static int dn_dst_gc(void);
+static int dn_dst_gc(struct dst_ops *ops);
 static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
 static void dn_dst_link_failure(struct sk_buff *);
@@ -185,7 +185,7 @@
 	mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
 }
 
-static int dn_dst_gc(void)
+static int dn_dst_gc(struct dst_ops *ops)
 {
 	struct dn_route *rt, **rtp;
 	int i;