net: Put flowi_* prefix on AF independent members of struct flowi

I intend to turn struct flowi into a union of AF specific flowi
structs.  There will be a common structure that each variant includes
first, much like struct sock_common.

This is the first step to move in that direction.

Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/fib_semantics.c

@@ -563,7 +563,7 @@ static int fib_check_nh(struct fib_config *cfg, struct fib_info *fi,
 			struct flowi fl = {
 				.fl4_dst = nh->nh_gw,
 				.fl4_scope = cfg->fc_scope + 1,
-				.oif = nh->nh_oif,
+				.flowi_oif = nh->nh_oif,
 			};
 
 			/* It is not necessary, but requires a bit of thinking */