ipv4: Attach FIB info to dst_default_metrics when possible

If there are no explicit metrics attached to a route, hook
fi->fib_info up to dst_default_metrics.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dst.c b/net/core/dst.c
index 5788935..c1674fd 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -164,7 +164,7 @@
 }
 EXPORT_SYMBOL(dst_discard);
 
-static const u32 dst_default_metrics[RTAX_MAX];
+const u32 dst_default_metrics[RTAX_MAX];
 
 void *dst_alloc(struct dst_ops *ops)
 {