esas2r: don't bother with __copy_to_user()

sure, we'd done copy_from_user() on the same range, so we can
skip access_ok()... and it's not worth bothering.  Just use
copy_to_user().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/scsi/esas2r/esas2r_ioctl.c

@@ -1510,7 +1510,7 @@ int esas2r_ioctl_handler(void *hostdata, unsigned int cmd, void __user *arg)
 	}
 
 	/* Always copy the buffer back, if only to pick up the status */
-	err = __copy_to_user(arg, ioctl, sizeof(struct atto_express_ioctl));
+	err = copy_to_user(arg, ioctl, sizeof(struct atto_express_ioctl));
 	if (err != 0) {
 		esas2r_log(ESAS2R_LOG_WARN,
 			   "ioctl_handler copy_to_user didn't copy everything (err %d, cmd %u)",