iov_iter: don't revert iov buffer if csum error
The patch 32786821 (make skb_copy_datagram_msg() et.al. preserve ->msg_iter on error) will revert the iov buffer if copy to iter failed, but it didn't copy any datagram if the skb_checksum_complete error, so no need to revert any data at this place. v2: Sabrina notice that return -EFAULT when checksum error is not correct here, it would confuse the caller about the return value, so fix it. Fixes: 32786821 ("make skb_copy_datagram_msg() et.al. preserve->msg_iter on error") Cc: stable@vger.kernel.org # v4.11 Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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