conf: handle fatal errors with GError

Don't call g_error(), which will abort the process and dump core.

This patch does not affect all the config_get_X() functions.  These
need some more refactoring.

test/read_conf.c

@@ -37,6 +37,8 @@ my_log_func(G_GNUC_UNUSED const gchar *log_domain,
 int main(int argc, char **argv)
 {
 	const char *path, *name, *value;
+	GError *error = NULL;
+	bool success;
 	int ret;
 
 	if (argc != 3) {
@@ -50,7 +52,12 @@ int main(int argc, char **argv)
 	g_log_set_default_handler(my_log_func, NULL);
 
 	config_global_init();
-	config_read_file(path);
+	success = config_read_file(path, &error);
+	if (!success) {
+		g_printerr("%s:", error->message);
+		g_error_free(error);
+		return 1;
+	}
 
 	value = config_get_string(name, NULL);
 	if (value != NULL) {

test/run_encoder.c

@@ -73,7 +73,7 @@ int main(int argc, char **argv)
 	}
 
 	param = config_new_param(NULL, -1);
-	config_add_block_param(param, "quality", "5.0", -1);
+	config_add_block_param(param, "quality", "5.0", -1, NULL);
 
 	encoder = encoder_init(plugin, param, &error);
 	if (encoder == NULL) {

test/run_filter.c

@@ -90,7 +90,12 @@ int main(int argc, char **argv)
 	/* read configuration file (mpd.conf) */
 
 	config_global_init();
-	config_read_file(argv[1]);
+	success = config_read_file(argv[1], &error);
+	if (!success) {
+		g_printerr("%s:", error->message);
+		g_error_free(error);
+		return 1;
+	}
 
 	/* parse the audio format */
 

test/run_output.c

@@ -122,7 +122,12 @@ int main(int argc, char **argv)
 	/* read configuration file (mpd.conf) */
 
 	config_global_init();
-	config_read_file(argv[1]);
+	success = config_read_file(argv[1], &error);
+	if (!success) {
+		g_printerr("%s:", error->message);
+		g_error_free(error);
+		return 1;
+	}
 
 	/* initialize the audio output */