add missing const

Change-Id: I20baebc41bd833764bbe828dd63df5218a12ce20
Reviewed-on: https://gerrit.libreoffice.org/80349
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/vcl/BitmapPalette.hxx b/include/vcl/BitmapPalette.hxx
index 1e61c8ecf1c5..ba6ef09af9f4 100644
--- a/include/vcl/BitmapPalette.hxx
+++ b/include/vcl/BitmapPalette.hxx
@@ -72,7 +72,7 @@ public:
         return !( *this == rBitmapPalette );
     }
 
-    bool operator!()
+    bool operator!() const
     {
         return maBitmapColor.empty();
     }