updated to protobuf 1.5.1

Signed-off-by: Dimitri Papadopoulos <3350651-DimitriPapadopoulos@users.noreply.gitlab.com>

NEWS

@@ -1,4 +1,5 @@
 * Version 1.3.1 (unreleased)
+- The bundled protobuf-c was updated to 1.5.1.
 - Fixed issues with PAM authentication when combined with pam_sssd (#618)
 - Enhanced the seccomp filters to address issue in testing (#627)
 

src/protobuf/protobuf-c/protobuf-c.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2023, Dave Benson and the protobuf-c authors.
+ * Copyright (c) 2008-2025, Dave Benson and the protobuf-c authors.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -28,14 +28,14 @@
  */
 
 /*! \file
- * Support library for `protoc-c` generated code.
+ * Support library for `protoc-gen-c` generated code.
  *
  * This file implements the public API used by the code generated
- * by `protoc-c`.
+ * by `protoc-gen-c`.
  *
  * \authors Dave Benson and the protobuf-c authors
  *
- * \copyright 2008-2014. Licensed under the terms of the [BSD-2-Clause] license.
+ * \copyright 2008-2025. Licensed under the terms of the [BSD-2-Clause] license.
  */
 
 /**
@@ -3278,6 +3278,8 @@ protobuf_c_message_unpack(const ProtobufCMessageDescriptor *desc,
 					      n_unknown * sizeof(ProtobufCMessageUnknownField));
 		if (rv->unknown_fields == NULL)
 			goto error_cleanup;
+	} else {
+		rv->unknown_fields = NULL;
 	}
 
 	/* do real parsing */

src/protobuf/protobuf-c/protobuf-c.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2023, Dave Benson and the protobuf-c authors.
+ * Copyright (c) 2008-2025, Dave Benson and the protobuf-c authors.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -34,16 +34,17 @@
  *
  * This file defines the public API for the `libprotobuf-c` support library.
  * This API includes interfaces that can be used directly by client code as well
- * as the interfaces used by the code generated by the `protoc-c` compiler.
+ * as the interfaces used by the code generated by the `protoc-gen-c` compiler
+ * plugin.
  *
  * The `libprotobuf-c` support library performs the actual serialization and
  * deserialization of Protocol Buffers messages. It interacts with structures,
- * definitions, and metadata generated by the `protoc-c` compiler from .proto
- * files.
+ * definitions, and metadata generated by the `protoc-gen-c` compiler plugin
+ * from .proto files.
  *
  * \authors Dave Benson and the `protobuf-c` authors.
  *
- * \copyright 2008-2014. Licensed under the terms of the [BSD-2-Clause] license.
+ * \copyright 2008-2025. Licensed under the terms of the [BSD-2-Clause] license.
  *
  * [protobuf-c]:       https://github.com/protobuf-c/protobuf-c
  * [Protocol Buffers]: https://developers.google.com/protocol-buffers/
@@ -74,7 +75,7 @@
  *
  * - Identifiers for functions and globals are all lowercase, with camel case
  *   words separated by single underscores. For example, one of the function
- *   prototypes generated by `protoc-c` for the above example:
+ *   prototypes generated by `protoc-gen-c` for the above example:
  *
 ~~~{.c}
 Foo__Bar__BazBah *
@@ -794,16 +795,16 @@ protobuf_c_version_number(void);
  * The version of the protobuf-c headers, represented as a string using the same
  * format as protobuf_c_version().
  */
-#define PROTOBUF_C_VERSION		"1.5.0"
+#define PROTOBUF_C_VERSION		"1.5.1"
 
 /**
  * The version of the protobuf-c headers, represented as an integer using the
  * same format as protobuf_c_version_number().
  */
-#define PROTOBUF_C_VERSION_NUMBER	1005000
+#define PROTOBUF_C_VERSION_NUMBER	1005001
 
 /**
- * The minimum protoc-c version which works with the current version of the
+ * The minimum protoc-gen-c version which works with the current version of the
  * protobuf-c headers.
  */
 #define PROTOBUF_C_MIN_COMPILER_VERSION	1000000