Assertions when lowering tcp_tso_win_divisor

[Sridhar Samudrala <sri@xxxxxxxxxx>]

We are seeing following assertions when running specweb99 with
tcp_tso_win_divisor lowered to 4, 2 or 1 on linux 2.6.9 based kernels.

KERNEL: assertion (!sk->sk_forward_alloc) failed at net/core/stream.c (279)
KERNEL: assertion (!sk->sk_forward_alloc) failed at net/ipv4/af_inet.c (152)

looks like an issue with the accounting of sk_forward_alloc with non-default
values of tcp_tso_win_divisor.

Thanks
Sridhar