[IPv4] Fix thinko in fib_find_alias

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

fib_find_alias is meant to return either an exact match or the
entry just before where it should be.  Currently it returns the
entry after that.  This patch fixes that.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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