put iov_iter into msghdr

Note that the code _using_ ->msg_iter at that point will be very
unhappy with anything other than unshifted iovec-backed iov_iter.
We still need to convert users to proper primitives.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc crypto/algif_hash.c
Simple merge

diff --cc crypto/algif_skcipher.c
Simple merge

diff --cc drivers/net/macvtap.c
Simple merge

diff --cc drivers/net/tun.c
Simple merge

diff --cc drivers/vhost/net.c
Simple merge

diff --cc fs/afs/rxrpc.c
Simple merge

diff --cc include/linux/skbuff.h
Simple merge

diff --cc include/linux/socket.h
Simple merge

diff --cc include/net/bluetooth/l2cap.h
Simple merge

diff --cc include/net/udplite.h
Simple merge

diff --cc net/atm/common.c
Simple merge

diff --cc net/bluetooth/6lowpan.c
Simple merge

diff --cc net/bluetooth/a2mp.c
Simple merge

diff --cc net/bluetooth/smp.c
Simple merge

diff --cc net/caif/caif_socket.c
Simple merge

diff --cc net/compat.c
Simple merge

diff --cc net/ipv4/ip_output.c
Simple merge

diff --cc net/ipv4/ping.c
Simple merge

diff --cc net/ipv4/raw.c
Simple merge

diff --cc net/ipv4/tcp.c
Simple merge

diff --cc net/ipv4/tcp_output.c
Simple merge

diff --cc net/ipv6/ping.c
Simple merge

diff --cc net/ipv6/raw.c
Simple merge

diff --cc net/netlink/af_netlink.c
Simple merge

diff --cc net/packet/af_packet.c
Simple merge

diff --cc net/rds/recv.c
Simple merge

diff --cc net/rds/send.c
Simple merge

diff --cc net/rxrpc/ar-output.c
Simple merge

diff --cc net/sctp/socket.c
Simple merge

diff --cc net/socket.c
Simple merge

diff --cc net/tipc/msg.c
Simple merge

diff --cc net/unix/af_unix.c
Simple merge

diff --cc net/vmw_vsock/vmci_transport.c
Simple merge