ipv4: call __ip_options_echo() in cookie_v4_check()

ipv4: call __ip_options_echo() in cookie_v4_check()

commit 971f10eca186cab238c49da ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
missed that cookie_v4_check() still calls ip_options_echo() which uses
IPCB(). It should use TCPCB() at TCP layer, so call __ip_options_echo()
instead.

Fixes: commit 971f10eca186cab238c49da ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
Cc: Krzysztof Kolasa <[email protected]>
Cc: Eric Dumazet <[email protected]>
Reported-by: Krzysztof Kolasa <[email protected]>
Tested-by: Krzysztof Kolasa <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>