rds: Make rds_message_copy_from_user() return 0 on success.
Commit 083735f4 ("rds: switch rds_message_copy_from_user() to iov_iter") breaks rds_message_copy_from_user() semantics on success, and causes it to return nbytes copied, when it should return 0. This commit fixes that bug. Signed-off-by: NSowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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