Fix Jim interpreter memory leak

Change-Id: I71d7d97e7dc315c42fc43b65cb5fcecd7bdfb581
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/2959
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/helper/command.c

@@ -1339,6 +1339,15 @@ struct command_context *command_init(const char *startup_tcl, Jim_Interp *interp
 	return context;
 }
 
+void command_exit(struct command_context *context)
+{
+	if (!context)
+		return;
+
+	Jim_FreeInterp(context->interp);
+	command_done(context);
+}
+
 int command_context_mode(struct command_context *cmd_ctx, enum command_mode mode)
 {
 	if (!cmd_ctx)

src/helper/command.h

@@ -307,6 +307,14 @@ struct command_context *current_command_context(Jim_Interp *interp);
  * creates a command interpreter.
  */
 struct command_context *command_init(const char *startup_tcl, Jim_Interp *interp);
+/**
+ * Shutdown a command context.
+ *
+ * Free the command context and the associated Jim interpreter.
+ *
+ * @param context The command_context that will be destroyed.
+ */
+void command_exit(struct command_context *context);
 /**
  * Creates a copy of an existing command context.  This does not create
  * a deep copy of the command list, so modifications in one context will

src/openocd.c

@@ -344,8 +344,8 @@ int openocd_main(int argc, char *argv[])
 
 	unregister_all_commands(cmd_ctx, NULL);
 
-	/* free commandline interface */
-	command_done(cmd_ctx);
+	/* Shutdown commandline interface */
+	command_exit(cmd_ctx);
 
 	adapter_quit();