a bug, when defining a multiple option with default value

Dear list,

I found a bug, when defining a multiple option with default value. The 
value is assigned but the given variable is not increased:

else /* set the default value */
    {
      if (! args_info->seri_arg && ! args_info->seri_given)
        {
          args_info->seri_arg = (char * *) malloc (sizeof (char *));
          args_info->seri_arg [0] = gengetopt_strdup("/dev/ttyS1");
          args_info->seri_orig = (char **) malloc (sizeof (char *));
          args_info->seri_orig [0] = NULL;
          // here should the variable be increased
        }
    }

// here args_info->seri_given takes 0 value, so I can't access 
args_info->seri_arg
args_info->seri_given += local_args_info.seri_given;
local_args_info.seri_given = 0;

I use the latest version 2.19.1.

Best regards,
Yegor Yefremov