Remove tmpFiles Array in Swift.php

tmpFiles Array is unnecessary and there has been
a reference without an assignment which lead to a bug making swift external
storage unuseable.

apps/files_external/lib/Lib/Storage/Swift.php

@@ -74,11 +74,6 @@ class Swift extends \OC\Files\Storage\Common {
 	/** @var string  */
 	private $id;
 
-	/**
-	 * @var array
-	 */
-	private static $tmpFiles = array();
-
 	/**
 	 * Key value cache mapping path to data object. Maps path to
 	 * \OpenCloud\OpenStack\ObjectStorage\Resource\DataObject for existing
@@ -617,7 +612,7 @@ class Swift extends \OC\Files\Storage\Common {
 		$fileData = fopen($tmpFile, 'r');
 		$this->getContainer()->uploadObject($path, $fileData);
 		// invalidate target object to force repopulation on fetch
-		$this->objectCache->remove(self::$tmpFiles[$tmpFile]);
+		$this->objectCache->remove($path);
 		unlink($tmpFile);
 	}