drbd: use consistent license

DRBD currently has a mix of GPL-2.0 and GPL-2.0-or-later SPDX license
identifiers. We have decided to stick with GPL 2.0 only, so consistently
use that identifier.
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20221122134301.69258-5-christoph.boehmwalder@linbit.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/drbd/Kconfig

-# SPDX-License-Identifier: GPL-2.0
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # DRBD device driver configuration
 #

drivers/block/drbd/Makefile

-# SPDX-License-Identifier: GPL-2.0
+# SPDX-License-Identifier: GPL-2.0-only
 drbd-y := drbd_bitmap.o drbd_proc.o
 drbd-y += drbd_worker.o drbd_receiver.o drbd_req.o drbd_actlog.o
 drbd-y += drbd_main.o drbd_strings.o drbd_nl.o

drivers/block/drbd/drbd_actlog.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_actlog.c
 

drivers/block/drbd/drbd_bitmap.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_bitmap.c
 

drivers/block/drbd/drbd_debugfs.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 #define pr_fmt(fmt) "drbd debugfs: " fmt
 #include <linux/kernel.h>
 #include <linux/module.h>

drivers/block/drbd/drbd_debugfs.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/debugfs.h>

drivers/block/drbd/drbd_int.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
   drbd_int.h
 

drivers/block/drbd/drbd_interval.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 #include <asm/bug.h>
 #include <linux/rbtree_augmented.h>
 #include "drbd_interval.h"

drivers/block/drbd/drbd_interval.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __DRBD_INTERVAL_H
 #define __DRBD_INTERVAL_H
 

drivers/block/drbd/drbd_main.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd.c
 

drivers/block/drbd/drbd_nl.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_nl.c
 

drivers/block/drbd/drbd_nla.c

-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
 #include <linux/kernel.h>
 #include <net/netlink.h>
 #include <linux/drbd_genl_api.h>

drivers/block/drbd/drbd_nla.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __DRBD_NLA_H
 #define __DRBD_NLA_H
 

drivers/block/drbd/drbd_proc.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_proc.c
 

drivers/block/drbd/drbd_protocol.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __DRBD_PROTOCOL_H
 #define __DRBD_PROTOCOL_H
 

drivers/block/drbd/drbd_receiver.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_receiver.c
 

drivers/block/drbd/drbd_req.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_req.c
 

drivers/block/drbd/drbd_req.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
    drbd_req.h
 

drivers/block/drbd/drbd_state.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_state.c
 

drivers/block/drbd/drbd_state.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef DRBD_STATE_H
 #define DRBD_STATE_H
 

drivers/block/drbd/drbd_state_change.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef DRBD_STATE_CHANGE_H
 #define DRBD_STATE_CHANGE_H
 

drivers/block/drbd/drbd_strings.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
   drbd.h
 

drivers/block/drbd/drbd_strings.h

-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef __DRBD_STRINGS_H
 #define __DRBD_STRINGS_H
 

drivers/block/drbd/drbd_vli.h

-/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
 -*- linux-c -*-
    drbd_receiver.c

drivers/block/drbd/drbd_worker.c

-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-License-Identifier: GPL-2.0-only
 /*
    drbd_worker.c