Merge pull request #58328 from nextcloud/backport/58107/stable33

[stable33] fix: don't try to create preview folder if it already exists

Author: icewind1991

lib/private/Preview/Storage/LocalPreviewStorage.php

@@ -81,7 +81,9 @@ private function constructPath(Preview $preview): string {
 
 	private function createParentFiles(string $path): void {
 		$dirname = dirname($path);
-		@mkdir($dirname, recursive: true);
+		if (!is_dir($dirname)) {
+			mkdir($dirname, recursive: true);
+		}
 		if (!is_dir($dirname)) {
 			throw new NotPermittedException("Unable to create directory '$dirname'");
 		}