gdi32: Fix a typo

[Andrew Talbot]

Changelog:
    gdi32: Fix a typo.

diff --git a/dlls/gdi32/dc.c b/dlls/gdi32/dc.c
index 705d263..161e0df 100644
--- a/dlls/gdi32/dc.c
+++ b/dlls/gdi32/dc.c
@@ -472,7 +472,7 @@ void WINAPI SetDCState( HDC hdc, HDC hdcs )
         release_dc_ptr( dc );
         return;
     }
-    if (!dcs->flags & DC_SAVED)
+    if (!(dcs->flags & DC_SAVED))
     {
         release_dc_ptr( dc );
         release_dc_ptr( dcs );