sendmmsg: put_user vs __put_user

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Shouldn't the compat code in the sendmmsg implementation use the same
code as the normal code?  In which case you probably want something
like this:

diff --git a/net/socket.c b/net/socket.c
index 484cc69..ff40409 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2064,7 +2064,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user
*mmsg, unsigned int vlen,
                                            &msg_sys, flags, &used_address);
                        if (err < 0)
-                       err = __put_user(err, &compat_entry->msg_len);
+                       err = put_user(err, &compat_entry->msg_len);
                } else {
                        err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
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