ipv4: no CHECKSUM_PARTIAL on MSG_MORE corked sockets

ipv4: no CHECKSUM_PARTIAL on MSG_MORE corked sockets

We cannot reliable calculate packet size on MSG_MORE corked sockets
and thus cannot decide if they are going to be fragmented later on,
so better not use CHECKSUM_PARTIAL in the first place.

Cc: Eric Dumazet <[email protected]>
Cc: Vlad Yasevich <[email protected]>
Cc: Benjamin Coddington <[email protected]>
Cc: Tom Herbert <[email protected]>
Signed-off-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>