[IPv4] Missing TOS checks after fib_find_alias

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

It looks like some of the places where FIB_SCAN_TOS macros were used
have lost the tos check.  This patch adds them back.

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

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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