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refcount_t type should be used instead of int when fib_treeref is used as
a reference counter,and avoid use-after-free risks.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20210729071350.28919-1-yajun.deng@linux.dev

Signed-off-by: Jakub Kicinski <kuba@kernel.org>