net: ipv4: make fib_select_default static

fib_select_default has a single caller within the same file.
Make it static.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip_fib.h

@@ -344,7 +344,6 @@ __be32 fib_compute_spec_dst(struct sk_buff *skb);
 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
 			u8 tos, int oif, struct net_device *dev,
 			struct in_device *idev, u32 *itag);
-void fib_select_default(const struct flowi4 *flp, struct fib_result *res);
 #ifdef CONFIG_IP_ROUTE_CLASSID
 static inline int fib_num_tclassid_users(struct net *net)
 {

net/ipv4/fib_semantics.c

@@ -1434,7 +1434,7 @@ int fib_sync_down_dev(struct net_device *dev, unsigned long event, bool force)
 }
 
 /* Must be invoked inside of an RCU protected region.  */
-void fib_select_default(const struct flowi4 *flp, struct fib_result *res)
+static void fib_select_default(const struct flowi4 *flp, struct fib_result *res)
 {
 	struct fib_info *fi = NULL, *last_resort = NULL;
 	struct hlist_head *fa_head = res->fa_head;