untangling process_vm_..., part 3
untangling process_vm_..., part 3

lift iov one more level out - from process_vm_rw_single_vec to
process_vm_rw_core().  Same story as with the previous commit.

Signed-off-by: Al Viro <de609eb4d5d70b1d38ec6642adbfc33a2781f63c@zeniv.linux.org.uk>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs