Merge pull request #3507 from owncloud/remove_unused_vars

apps/files_encryption/ajax/adminrecovery.php

apps/files_encryption/ajax/changeRecoveryPassword.php

apps/files_encryption/ajax/userrecovery.php

apps/files_encryption/appinfo/app.php

apps/files_encryption/hooks/hooks.php

apps/files_encryption/lib/crypt.php

apps/files_encryption/lib/helper.php

apps/files_encryption/lib/keymanager.php

apps/files_encryption/lib/proxy.php

apps/files_encryption/lib/session.php

apps/files_encryption/lib/stream.php

apps/files_encryption/lib/util.php

apps/files_encryption/settings-admin.php

apps/files_encryption/settings-personal.php

apps/files_encryption/tests/crypt.php

apps/files_encryption/tests/webdav.php