Bug 1635828 - Isolate HSTS per first-party when privacy.partition.network_state is set to true - part 5 - Fix the build bustage issue. r=dimi

Differential Revision: https://phabricator.services.mozilla.com/D90815

toolkit/components/antitracking/StoragePrincipalHelper.cpp

@@ -351,6 +351,10 @@ bool StoragePrincipalHelper::GetOriginAttributesForHSTS(
   bool ok = FindCharInReadable(',', iter, end);
   MOZ_DIAGNOSTIC_ASSERT(ok);
 
+  if (!ok) {
+    return false;
+  }
+
   nsAutoString scheme;
   scheme.Assign(Substring(start, iter));