*: use nullptr instead of NULL

src/archive/Bzip2ArchivePlugin.cxx

@@ -185,7 +185,7 @@ Bzip2ArchiveFile::OpenStream(const char *path,
 	Bzip2InputStream *bis = new Bzip2InputStream(*this, path, mutex, cond);
 	if (!bis->Open(error)) {
 		delete bis;
-		return NULL;
+		return nullptr;
 	}
 
 	return &bis->base;
@@ -273,7 +273,7 @@ bz2_is_eof(struct input_stream *is)
 
 static const char *const bz2_extensions[] = {
 	"bz2",
-	NULL
+	nullptr
 };
 
 const InputPlugin bz2_inputplugin = {

src/archive/Iso9660ArchivePlugin.cxx

@@ -118,7 +118,7 @@ iso9660_archive_open(const char *pathname, Error &error)
 	if (iso == nullptr) {
 		error.Format(iso9660_domain,
 			     "Failed to open ISO9660 file %s", pathname);
-		return NULL;
+		return nullptr;
 	}
 
 	return new Iso9660ArchiveFile(iso);
@@ -168,7 +168,7 @@ Iso9660ArchiveFile::OpenStream(const char *pathname,
 	if (statbuf == nullptr) {
 		error.Format(iso9660_domain,
 			     "not found in the ISO file: %s", pathname);
-		return NULL;
+		return nullptr;
 	}
 
 	Iso9660InputStream *iis =
@@ -236,7 +236,7 @@ iso9660_input_eof(struct input_stream *is)
 
 static const char *const iso9660_archive_extensions[] = {
 	"iso",
-	NULL
+	nullptr
 };
 
 const InputPlugin iso9660_input_plugin = {

src/archive/ZzipArchivePlugin.cxx

@@ -75,11 +75,11 @@ static constexpr Domain zzip_domain("zzip");
 static ArchiveFile *
 zzip_archive_open(const char *pathname, Error &error)
 {
-	ZZIP_DIR *dir = zzip_dir_open(pathname, NULL);
+	ZZIP_DIR *dir = zzip_dir_open(pathname, nullptr);
 	if (dir == nullptr) {
 		error.Format(zzip_domain, "Failed to open ZIP file %s",
 			     pathname);
-		return NULL;
+		return nullptr;
 	}
 
 	return new ZzipArchiveFile(dir);
@@ -137,7 +137,7 @@ ZzipArchiveFile::OpenStream(const char *pathname,
 	if (_file == nullptr) {
 		error.Format(zzip_domain, "not found in the ZIP file: %s",
 			     pathname);
-		return NULL;
+		return nullptr;
 	}
 
 	ZzipInputStream *zis =
@@ -199,7 +199,7 @@ zzip_input_seek(struct input_stream *is, InputPlugin::offset_type offset,
 
 static const char *const zzip_archive_extensions[] = {
 	"zip",
-	NULL
+	nullptr
 };
 
 const InputPlugin zzip_input_plugin = {