[stable] tcp: drop SYN+FIN messages

It looks like this is needed in 3.0.y and 3.2.y:

commit fdf5af0daf8019cec2396cdef8fb042d80fe71fa
Author: Eric Dumazet [off-list ref]
Date:   Fri Dec 2 23:41:42 2011 +0000

    tcp: drop SYN+FIN messages

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                            - Robert Coveyou