staging: lustre: return -EFAULT instead of bytes remaining

return -EFAULT instead of the value returned by copy_from_user()
Signed-off-by: NVitaly Osipov <vitaly.osipov@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/libcfs/linux/linux-module.c

@@ -45,14 +45,12 @@ int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
 	struct libcfs_ioctl_hdr   *hdr;
 	struct libcfs_ioctl_data  *data;
 	int orig_len;
-	int err;
 
 	hdr = (struct libcfs_ioctl_hdr *)buf;
 	data = (struct libcfs_ioctl_data *)buf;
 
-	err = copy_from_user(buf, (void *)arg, sizeof(*hdr));
-	if (err)
-		return err;
+	if (copy_from_user(buf, (void *)arg, sizeof(*hdr)))
+		return -EFAULT;
 
 	if (hdr->ioc_version != LIBCFS_IOCTL_VERSION) {
 		CERROR("PORTALS: version mismatch kernel vs application\n");
@@ -71,9 +69,8 @@ int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
 	}
 
 	orig_len = hdr->ioc_len;
-	err = copy_from_user(buf, (void *)arg, hdr->ioc_len);
-	if (err)
-		return err;
+	if (copy_from_user(buf, (void *)arg, hdr->ioc_len))
+		return -EFAULT;
 	if (orig_len != data->ioc_len)
 		return -EINVAL;