helper/configuration: free script_search_dirs and config_file_names

Although the leak is negligible, the clean heap on exit will ease
valgrind testing.

Change-Id: If43f02fe594c30ceb1bea3259ea3e098d4b2d239
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4408
Tested-by: jenkins
Reviewed-by: Marc Schink <openocd-dev@marcschink.de>

src/helper/configuration.c

@@ -51,6 +51,21 @@ void add_config_command(const char *cfg)
 	config_file_names[num_config_files] = NULL;
 }
 
+void free_config(void)
+{
+	while (num_config_files)
+		free(config_file_names[--num_config_files]);
+
+	free(config_file_names);
+	config_file_names = NULL;
+
+	while (num_script_dirs)
+		free(script_search_dirs[--num_script_dirs]);
+
+	free(script_search_dirs);
+	script_search_dirs = NULL;
+}
+
 /* return full path or NULL according to search rules */
 char *find_file(const char *file)
 {

src/helper/configuration.h

@@ -32,6 +32,8 @@ void add_config_command(const char *cfg);
 
 void add_script_search_dir(const char *dir);
 
+void free_config(void);
+
 int configuration_output_handler(struct command_context *cmd_ctx,
 		const char *line);
 

src/openocd.c

@@ -349,6 +349,8 @@ int openocd_main(int argc, char *argv[])
 
 	adapter_quit();
 
+	free_config();
+
 	if (ERROR_FAIL == ret)
 		return EXIT_FAILURE;
 	else if (ERROR_OK != ret)