Fix typo

plugins/calendar/drivers/resources_driver.php

@@ -21,13 +21,12 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-
 /**
  * Interface definition for a resources directory driver classe
  */
 abstract class resources_driver
 {
-  protected$cal;
+  protected $cal;
 
   /**
    * Default constructor
@@ -110,5 +109,4 @@ abstract class resources_driver
 
       return $events;
   }
-
 }