[TCP] Fix tcp_current_mss when MTU changes

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Dave:

There is a small bug in tcp_current_mss where it can return the real
MSS when MTU changes even if the TSO MSS is what is intended.  This
patch fixes it.

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

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