OLE32: fixed ReleaseStgMedium

[Alberto Massari <alby@exln.com>]

The current behavior of ReleaseStgMedium is to perform the operation, then set the pointer to the object to NULL; instead, on Windows, the behavior is to perform the operation, then set the "tymed" enumerator to TYMED_NULL, leaving the pointer as it is. Internet Explorer 6 relies on this behavior to access the object after the STGMENIUM has been released.
With this patch, Internet Explorer 6.0 can be used with the built-in ole32.dll  (that is, I can view a bunch of web sites before crashing on other problems...)

Changelog:
- align the cleanup phase of ReleaseStgMedium to the native API
- when the data is a bitmap or an enhanced metafile, use the correct data member (they are inside a union, so there is no practical difference, but this should be the right thing to do)

Alberto

Index: ole2.c
===================================================================
RCS file: /home/wine/wine/dlls/ole32/ole2.c,v
retrieving revision 1.39
diff -u -r1.39 ole2.c
--- ole2.c	7 Jan 2003 20:36:27 -0000	1.39
+++ ole2.c	14 Jan 2003 11:38:44 -0000
@@ -1513,8 +1513,6 @@
       if ( (pmedium->pUnkForRelease==0) &&
 	   (pmedium->u.hGlobal!=0) )
 	GlobalFree(pmedium->u.hGlobal);
-
-      pmedium->u.hGlobal = 0;
       break;
     }
     case TYMED_FILE:
@@ -1528,8 +1526,6 @@
 
 	CoTaskMemFree(pmedium->u.lpszFileName);
       }
-
-      pmedium->u.lpszFileName = 0;
       break;
     }
     case TYMED_ISTREAM:
@@ -1538,8 +1534,6 @@
       {
 	IStream_Release(pmedium->u.pstm);
       }
-
-      pmedium->u.pstm = 0;
       break;
     }
     case TYMED_ISTORAGE:
@@ -1548,17 +1542,13 @@
       {
 	IStorage_Release(pmedium->u.pstg);
       }
-
-      pmedium->u.pstg = 0;
       break;
     }
     case TYMED_GDI:
     {
       if ( (pmedium->pUnkForRelease==0) &&
-	   (pmedium->u.hGlobal!=0) )
-	DeleteObject(pmedium->u.hGlobal);
-
-      pmedium->u.hGlobal = 0;
+	   (pmedium->u.hBitmap!=0) )
+	DeleteObject(pmedium->u.hBitmap);
       break;
     }
     case TYMED_MFPICT:
@@ -1566,13 +1556,11 @@
       if ( (pmedium->pUnkForRelease==0) &&
 	   (pmedium->u.hMetaFilePict!=0) )
       {
-	LPMETAFILEPICT pMP = GlobalLock(pmedium->u.hGlobal);
+	LPMETAFILEPICT pMP = GlobalLock(pmedium->u.hMetaFilePict);
 	DeleteMetaFile(pMP->hMF);
-	GlobalUnlock(pmedium->u.hGlobal);
-	GlobalFree(pmedium->u.hGlobal);
+	GlobalUnlock(pmedium->u.hMetaFilePict);
+	GlobalFree(pmedium->u.hMetaFilePict);
       }
-
-      pmedium->u.hMetaFilePict = 0;
       break;
     }
     case TYMED_ENHMF:
@@ -1582,14 +1570,13 @@
       {
 	DeleteEnhMetaFile(pmedium->u.hEnhMetaFile);
       }
-
-      pmedium->u.hEnhMetaFile = 0;
       break;
     }
     case TYMED_NULL:
     default:
       break;
   }
+  pmedium->tymed=TYMED_NULL;
 
   /*
    * After cleaning up, the unknown is released