{compat_,}verify_iovec(): switch to generic copying of iovecs
use {compat_,}rw_copy_check_uvector(). As the result, we are
guaranteed that all iovecs seen in ->msg_iov by ->sendmsg()
and ->recvmsg() will pass access_ok().
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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