Bump dav app version and fix variable rename

apps/dav/appinfo/info.xml

@@ -5,7 +5,7 @@
 	<description>ownCloud WebDAV endpoint</description>
 	<licence>AGPL</licence>
 	<author>owncloud.org</author>
-	<version>0.2.4</version>
+	<version>0.2.5</version>
 	<default_enable/>
 	<types>
 		<filesystem/>

apps/dav/lib/CalDAV/CalDavBackend.php

@@ -1319,7 +1319,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 			throw new \Sabre\DAV\Exception\BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
 		}
 		if ($componentType === 'VEVENT' && $component->DTSTART) {
-			$firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
+			$firstOccurrence = $component->DTSTART->getDateTime()->getTimeStamp();
 			// Finding the last occurrence is a bit harder
 			if (!isset($component->RRULE)) {
 				if (isset($component->DTEND)) {
@@ -1333,7 +1333,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 					$endDate->modify('+1 day');
 					$lastOccurrence = $endDate->getTimeStamp();
 				} else {
-					$lastOccurrence = $firstOccurence;
+					$lastOccurrence = $firstOccurrence;
 				}
 			} else {
 				$it = new EventIterator($vObject, (string)$component->UID);