Fix previous erroneous assignment.

Author: drupol

src/DocBlock/Tags/InvalidTag.php

@@ -104,9 +104,9 @@ static function (&$value) : void {
         do {
             $trace = array_map(
                 static function (array $call) use ($flatten) : array {
-                    $args = $call['args'] ?? [];
+                    $call['args'] = $call['args'] ?? [];
 
-                    array_walk_recursive($args, $flatten);
+                    array_walk_recursive($call['args'], $flatten);
 
                     return $call;
                 },