Fix sparse warning:

net/ipv4/tcp_fastopen.c:75:29: warning:
 symbol 'tcp_fastopen_alloc_ctx' was not declared. Should it be static?
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Acked-by: NJason Baron <jbaron@akamai.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>