Zstd: Restore SPDX license identifiers

When updating Zstandard to version 1.5.7 the SPDX license identifiers
were lost. This commit restores them.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Moch <mail@alexmoch.com>
Closes #18089

module/zstd/lib/common/allocations.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/bits.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/bitstream.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /* ******************************************************************
  * bitstream
  * Part of FSE library

module/zstd/lib/common/compiler.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/cpu.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/debug.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /* ******************************************************************
  * debug
  * Part of FSE library

module/zstd/lib/common/entropy_common.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /* ******************************************************************
  * Common functions of New Generation Entropy library
  * Copyright (c) Meta Platforms, Inc. and affiliates.

module/zstd/lib/common/error_private.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/error_private.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/fse.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /* ******************************************************************
  * FSE : Finite State Entropy codec
  * Public Prototypes declaration

module/zstd/lib/common/fse_decompress.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /* ******************************************************************
  * FSE : Finite State Entropy decoder
  * Copyright (c) Meta Platforms, Inc. and affiliates.

module/zstd/lib/common/huf.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /* ******************************************************************
  * huff0 huffman codec,
  * part of Finite State Entropy library

module/zstd/lib/common/mem.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/pool.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/pool.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/portability_macros.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/xxhash.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * xxHash - Extremely Fast Hash algorithm
  * Header File

module/zstd/lib/common/zstd_common.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/zstd_deps.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/zstd_internal.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.

module/zstd/lib/common/zstd_trace.h

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only
 /*
  * Copyright (c) Meta Platforms, Inc. and affiliates.
  * All rights reserved.