[PATCH] win32: add comment about WinError

[Adrian Buehlmann]

# HG changeset patch
# User Adrian Buehlmann <adrian at cadifra.com>
# Date 1427537974 -3600
# Node ID f2b87f4856bfee50f6d970a8a7228b7ef2a2b8f5
# Parent  efa094701a05d58d505c3b0c3b3c73dba4e51e97
win32: add comment about WinError

Prevent reintroducing the bug that was added in e34106fa0dc3 (and fixed with
a2285e2fc949).

diff --git a/mercurial/win32.py b/mercurial/win32.py
--- a/mercurial/win32.py
+++ b/mercurial/win32.py
@@ -279,7 +279,7 @@
     buf = ctypes.create_string_buffer(size + 1)
     len = _kernel32.GetModuleFileNameA(None, ctypes.byref(buf), size)
     if len == 0:
-        raise ctypes.WinError()
+        raise ctypes.WinError() # Note: WinError is a function
     elif len == size:
         raise ctypes.WinError(_ERROR_INSUFFICIENT_BUFFER)
     return buf.value