Merge branch 'fix-gso_segs'

Eric Dumazet says:

====================
First patch changes the kernel, second patch
adds a new test.

Note that other patches might be needed to take
care of similar issues in sock_ops_convert_ctx_access()
and SOCK_OPS_GET_FIELD()
====================

Signed-off-by: Alexei Starovoitov <[email protected]>