win32.c: use numberof

* win32/win32.c (open_dir_handle): use numberof() macro.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50992 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/win32.c

@@ -1845,7 +1845,7 @@ open_dir_handle(const WCHAR *filename, WIN32_FIND_DATAW *fd)
     // Create the search pattern
     //
     len = lstrlenW(filename);
-    scanname = ALLOCV_N(WCHAR, v, len + sizeof(wildcard) / sizeof(WCHAR));
+    scanname = ALLOCV_N(WCHAR, v, len + numberof(wildcard));
     lstrcpyW(scanname, filename);
     p = CharPrevW(scanname, scanname + len);
     if (*p == L'/' || *p == L'\\' || *p == L':')