Fix backport

Signed-off-by: Git'Fellow <[email protected]>

Author: solracsf

lib/private/Files/Storage/Common.php

@@ -106,12 +106,12 @@ public function __construct($parameters) {
 	 * @return bool
 	 */
 	protected function remove($path) {
-		if ($this->is_dir($path)) {
-			return $this->rmdir($path);
-		} elseif ($this->is_file($path)) {
-			return $this->unlink($path);
-		} else {
-			return false;
+		if ($this->file_exists($path)) {
+			if ($this->is_dir($path)) {
+				return $this->rmdir($path);
+			} elseif ($this->is_file($path)) {
+				return $this->unlink($path);
+			}
 		}
 		return false;
 	}