Clean up some unused variables.

This is essentially 1ccc0c8c1a without the renames and some other things related to Psalm.

classes/OPML.php

@@ -612,8 +612,6 @@ class OPML extends Handler_Protected {
 	function opml_import(int $owner_uid, string $filename = "") {
 		if (!$owner_uid) return;
 
-		$doc = false;
-
 		if (!$filename) {
 			if ($_FILES['opml_file']['error'] != 0) {
 				print_error(T_sprintf("Upload failed with error code %d",
@@ -644,8 +642,6 @@ class OPML extends Handler_Protected {
 			return false;
 		}
 
-		$loaded = false;
-
 		$doc = new DOMDocument();
 
 		if (version_compare(PHP_VERSION, '8.0.0', '<')) {