fix check if file is excluded from encryption

lib/private/encryption/util.php

@@ -357,7 +357,7 @@ class Util {
 	public function isExcluded($path) {
 		$normalizedPath = \OC\Files\Filesystem::normalizePath($path);
 		$root = explode('/', $normalizedPath, 4);
-		if (count($root) > 2) {
+		if (count($root) > 1) {
 
 			//detect system wide folders
 			if (in_array($root[1], $this->excludedPaths)) {

tests/lib/encryption/utiltest.php

@@ -135,6 +135,7 @@ class UtilTest extends TestCase {
 
 	public function providePathsForTestIsExcluded() {
 		return array(
+			array('/files_encryption', true),
 			array('files_encryption/foo.txt', true),
 			array('test/foo.txt', false),
 			array('/user1/files_encryption/foo.txt', true),