Use ReleaseDC instead of DeleteDC on DC handle.

diff --git a/dlls/comctl32/header.c b/dlls/comctl32/header.c
index 7a5369f..2093d3a 100644
--- a/dlls/comctl32/header.c
+++ b/dlls/comctl32/header.c
@@ -339,7 +339,7 @@
 	    }
 
 	    DeleteObject(hClipRgn);
-	    DeleteDC(hClipDC);
+	    ReleaseDC(hwnd, hClipDC);
 	}
         
 	if (((phdi->fmt & HDF_STRING)