input/Plugin: migrate init() from class Error to C++ exceptions

src/input/plugins/CdioParanoiaInputPlugin.cxx

@@ -27,6 +27,7 @@
 #include "../InputPlugin.hxx"
 #include "util/StringUtil.hxx"
 #include "util/StringCompare.hxx"
+#include "util/RuntimeError.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "system/ByteOrder.hxx"
@@ -105,8 +106,8 @@ static constexpr Domain cdio_domain("cdio");
 
 static bool default_reverse_endian;
 
-static InputPlugin::InitResult
-input_cdio_init(const ConfigBlock &block, Error &error)
+static void
+input_cdio_init(const ConfigBlock &block)
 {
 	const char *value = block.GetBlockValue("default_byte_order");
 	if (value != nullptr) {
@@ -114,15 +115,10 @@ input_cdio_init(const ConfigBlock &block, Error &error)
 			default_reverse_endian = IsBigEndian();
 		else if (strcmp(value, "big_endian") == 0)
 			default_reverse_endian = IsLittleEndian();
-		else {
-			error.Format(config_domain, 0,
-				     "Unrecognized 'default_byte_order' setting: %s",
-				     value);
-			return InputPlugin::InitResult::ERROR;
-		}
+		else
+			throw FormatRuntimeError("Unrecognized 'default_byte_order' setting: %s",
+						 value);
 	}
-
-	return InputPlugin::InitResult::SUCCESS;
 }
 
 struct cdio_uri {

src/input/plugins/CurlInputPlugin.cxx

@@ -533,8 +533,8 @@ CurlMulti::OnTimeout()
  *
  */
 
-static InputPlugin::InitResult
-input_curl_init(const ConfigBlock &block, gcc_unused Error &error)
+static void
+input_curl_init(const ConfigBlock &block)
 {
 	CURLcode code = curl_global_init(CURL_GLOBAL_ALL);
 	if (code != CURLE_OK)
@@ -577,7 +577,6 @@ input_curl_init(const ConfigBlock &block, gcc_unused Error &error)
 	}
 
 	curl_multi = new CurlMulti(io_thread_get(), multi);
-	return InputPlugin::InitResult::SUCCESS;
 }
 
 static void

src/input/plugins/FfmpegInputPlugin.cxx

@@ -72,17 +72,14 @@ input_ffmpeg_supported(void)
 	return avio_enum_protocols(&opaque, 0) != nullptr;
 }
 
-static InputPlugin::InitResult
-input_ffmpeg_init(gcc_unused const ConfigBlock &block,
-		  gcc_unused Error &error)
+static void
+input_ffmpeg_init(gcc_unused const ConfigBlock &block)
 {
 	FfmpegInit();
 
 	/* disable this plugin if there's no registered protocol */
 	if (!input_ffmpeg_supported())
 		throw PluginUnavailable("No protocol");
-
-	return InputPlugin::InitResult::SUCCESS;
 }
 
 static InputStream *

src/input/plugins/NfsInputPlugin.cxx

@@ -215,11 +215,10 @@ NfsInputStream::OnNfsFileError(Error &&error)
  *
  */
 
-static InputPlugin::InitResult
-input_nfs_init(const ConfigBlock &, Error &)
+static void
+input_nfs_init(const ConfigBlock &)
 {
 	nfs_init();
-	return InputPlugin::InitResult::SUCCESS;
 }
 
 static void

src/input/plugins/SmbclientInputPlugin.cxx

@@ -68,8 +68,8 @@ public:
  *
  */
 
-static InputPlugin::InitResult
-input_smbclient_init(gcc_unused const ConfigBlock &block, gcc_unused Error &error)
+static void
+input_smbclient_init(gcc_unused const ConfigBlock &block)
 {
 	try {
 		SmbclientInit();
@@ -81,8 +81,6 @@ input_smbclient_init(gcc_unused const ConfigBlock &block, gcc_unused Error &erro
 	// TODO: create one global SMBCCTX here?
 
 	// TODO: evaluate ConfigBlock, call smbc_setOption*()
-
-	return InputPlugin::InitResult::SUCCESS;
 }
 
 static InputStream *