fix: check for correct storage class when checking for link parent

fixes #39123

Signed-off-by: Robin Appelman <robin@icewind.nl>

Author: icewind1991

lib/private/Share20/Manager.php

@@ -11,6 +11,7 @@
 use OC\KnownUser\KnownUserService;
 use OC\Share20\Exception\ProviderException;
 use OCA\Files_Sharing\AppInfo\Application;
+use OCA\Files_Sharing\SharedStorage;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\File;
 use OCP\Files\Folder;
@@ -570,7 +571,7 @@ protected function setLinkParent(IShare $share) {
 		// No sense in checking if the method is not there.
 		if (method_exists($share, 'setParent')) {
 			$storage = $share->getNode()->getStorage();
-			if ($storage->instanceOfStorage('\OCA\Files_Sharing\ISharedStorage')) {
+			if ($storage->instanceOfStorage(SharedStorage::class)) {
 				/** @var \OCA\Files_Sharing\SharedStorage $storage */
 				$share->setParent($storage->getShareId());
 			}