Bug fixes for unshare() and opendir(), thanks darkh

apps/files_sharing/lib_share.php

@@ -246,7 +246,7 @@ class OC_SHARE {
 	* @param $uid_shared_with Array of users to unshare the item from
 	*/
 	public static function unshare($source, $uid_shared_with) {
-		$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE source SUBSTR(source, 1, ?) = ? AND uid_shared_with = ? AND uid_owner = ?");
+		$query = OC_DB::prepare("DELETE FROM *PREFIX*sharing WHERE SUBSTR(source, 1, ?) = ? AND uid_shared_with = ? AND uid_owner = ?");
 		foreach ($uid_shared_with as $uid) {
 			$query->execute(array(strlen($source), $source, $uid, OC_USER::getUser()));
 		}

apps/files_sharing/sharedstorage.php

@@ -77,6 +77,9 @@ class OC_FILESTORAGE_SHARED extends OC_FILESTORAGE {
 			global $FAKEDIRS;
 			$path = $this->datadir.$path;
 			$sharedItems = OC_SHARE::getItemsInFolder($path);
+			if (empty($sharedItems)) {
+				return false;
+			}
 			foreach ($sharedItems as $item) {
 				// If item is in the root of the shared storage provider add it to the fakedirs
 				if (dirname($item['target'])."/" == $path) {