drupal_goto() error: must be array, string given

When accessing "d2c/%", the users that aren't logged in will be redirected to login via drupal_goto(). It appears as though this drupal_goto() call wasn't updated when coverting the module from Drupal 6.x to 7.x, because it's using the old arguments.

Here is the actual error:

Recoverable fatal error: Argument 2 passed to drupal_goto() must be an array, string given, called in /home/webuser/platforms/drupal-7.15/sites/all/modules/d2c/d2c_core/d2c_core.module on line 740 and defined in drupal_goto() (line 671 of /home/webuser/platforms/drupal-7.15/includes/common.inc).

I'll attach a patch to fix in a moment!