remove some useless code in lib/route/cls/u32.c
remove some useless code in lib/route/cls/u32.c

Cc: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>
Signed-off-by: Cong Wang <0f114804888b88d50037b04b42e57b858d851b87@gmail.com>
Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

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