Fixed some issues reported by winapi_check.

diff --git a/windows/mdi.c b/windows/mdi.c
index 9c170c3..39b696c 100644
--- a/windows/mdi.c
+++ b/windows/mdi.c
@@ -1874,7 +1874,7 @@
     return retvalue;
 }
 
-/***************************************
+/***********************************************************************
  * CreateMDIWindowW [USER32.80] Creates a MDI child in new thread
  *
  * RETURNS