Fix @requires_zlib

Author: StanFromIreland

Lib/test/support/__init__.py

@@ -493,8 +493,8 @@ def dec(*args, **kwargs):
     float.__getformat__("double").startswith("IEEE"),
     "test requires IEEE 754 doubles")
 
-def requires_zlib(reason):
-    return unittest.skipIf(sys.platform == "wasi", "zlib is unsupported on WASI")
+def requires_zlib(reason='zlib is unsupported on WASI'):
+    return unittest.skipIf(sys.platform == "wasi", reason)
 
 def requires_gzip(reason='requires gzip'):
     try: