The offload flag is a status flag and should not be used by
FIB semantics for comparison.

Fixes: 37ed9493 ("rtnetlink: add RTNH_F_EXTERNAL flag for fib offload")
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Reviewed-by: NAndy Gospodarek <andy@greyhouse.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>