config/Param: make "line" signed

src/LogInit.cxx

@@ -72,14 +72,14 @@ open_log_file(void)
 }
 
 static bool
-log_init_file(unsigned line, Error &error)
+log_init_file(int line, Error &error)
 {
 	assert(!out_path.IsNull());
 
 	out_fd = open_log_file();
 	if (out_fd < 0) {
 		const std::string out_path_utf8 = out_path.ToUTF8();
-		error.FormatErrno("failed to open log file \"%s\" (config line %u)",
+		error.FormatErrno("failed to open log file \"%s\" (config line %d)",
 				  out_path_utf8.c_str(), line);
 		return false;
 	}
@@ -89,7 +89,7 @@ log_init_file(unsigned line, Error &error)
 }
 
 static inline LogLevel
-parse_log_level(const char *value, unsigned line)
+parse_log_level(const char *value, int line)
 {
 	if (0 == strcmp(value, "default"))
 		return LogLevel::DEFAULT;
@@ -98,7 +98,7 @@ parse_log_level(const char *value, unsigned line)
 	else if (0 == strcmp(value, "verbose"))
 		return LogLevel::DEBUG;
 	else {
-		FormatFatalError("unknown log level \"%s\" at line %u",
+		FormatFatalError("unknown log level \"%s\" at line %d",
 				 value, line);
 	}
 }

src/config/Param.hxx

@@ -38,7 +38,7 @@ struct config_param {
 
 	std::string value;
 
-	unsigned int line;
+	int line;
 
 	std::vector<BlockParam> block_params;
 
@@ -66,7 +66,7 @@ struct config_param {
 	 * configuration file.
 	 */
 	bool IsNull() const {
-		return line == unsigned(-1);
+		return line < 0;
 	}
 
 	gcc_nonnull_all

src/output/plugins/ShoutOutputPlugin.cxx

@@ -97,7 +97,7 @@ require_block_string(const config_param &param, const char *name)
 	const char *value = param.GetBlockValue(name);
 	if (value == nullptr)
 		FormatFatalError("no \"%s\" defined for shout device defined "
-				 "at line %u\n", name, param.line);
+				 "at line %d\n", name, param.line);
 
 	return value;
 }