server: free strduped port numbers

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

Change-Id: I3a7a9c8e8dc7557aa51d0b9caa244537e5e7007d
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4410
Tested-by: jenkins

src/target/openrisc/jsp_server.c

@@ -242,3 +242,7 @@ int jsp_register_commands(struct command_context *cmd_ctx)
 	return register_commands(cmd_ctx, NULL, jsp_command_handlers);
 }
 
+void jsp_service_free(void)
+{
+	free(jsp_port);
+}

src/target/openrisc/jsp_server.h

@@ -13,5 +13,6 @@ struct jsp_service {
 
 int jsp_init(struct or1k_jtag *jtag_info, char *banner);
 int jsp_register_commands(struct command_context *cmd_ctx);
+void jsp_service_free(void);
 
 #endif /* OPENOCD_TARGET_OPENRISC_JSP_SERVER_H */