Relax lint check for licensing in files

tools/lint/lib/checks/license.py

@@ -31,7 +31,7 @@ class CheckLicense(Check):
         match = _LICENSE_PATTERN.search(source)
 
         if not match:
-            return 'No license information found.'
+            return
 
         year_str = match.group(2)
         try:

tools/lint/test/fixtures/license_missing.js

-LICENSE
 ^ expected errors | v input
 /*---
 esid: sec-assignment-operators-static-semantics-early-errors