Issue #3317658 by pooja saraah, mondrake, ravi.shankar, longwave: Fix HoldTestSubscriber PHPStan L0 issues

(cherry picked from commit 08b0f54bf4)

core/modules/system/tests/modules/hold_test/src/EventSubscriber/HoldTestSubscriber.php

@@ -59,9 +59,9 @@ class HoldTestSubscriber implements EventSubscriberInterface {
    */
   protected function hold($type) {
     $path = "{$this->sitePath}/hold_test_$type.txt";
-    do {
-      $status = (bool) file_get_contents($path);
-    } while ($status && (NULL === usleep(static::WAIT)));
+    while ((bool) file_get_contents($path)) {
+      usleep(static::WAIT);
+    }
   }
 
   /**

core/phpstan-baseline.neon

@@ -1095,11 +1095,6 @@ parameters:
 			count: 1
 			path: modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php
 
-		-
-			message: "#^Result of function usleep \\(void\\) is used\\.$#"
-			count: 1
-			path: modules/system/tests/modules/hold_test/src/EventSubscriber/HoldTestSubscriber.php
-
 		-
 			message: "#^Configuration entity must define a `config_export` key\\. See https\\://www\\.drupal\\.org/node/2481909$#"
 			count: 1