Normalize getUnjailedPath

Fixes #11637

If we do not normalize the unjailed path we might end up with a path
like files/user/folder/. which can break on objectstores

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

lib/private/Files/Storage/Wrapper/Jail.php

@@ -27,6 +27,7 @@
 
 use OC\Files\Cache\Wrapper\CacheJail;
 use OC\Files\Cache\Wrapper\JailPropagator;
+use OC\Files\Filesystem;
 use OCP\Files\Storage\IStorage;
 use OCP\Lock\ILockingProvider;
 
@@ -56,7 +57,7 @@ public function getUnjailedPath($path) {
 		if ($path === '') {
 			return $this->rootPath;
 		} else {
-			return $this->rootPath . '/' . $path;
+			return Filesystem::normalizePath($this->rootPath . '/' . $path);
 		}
 	}