Fix problem with black and/or random colours for paletted codecs, like MSRLE.

Shoulc close #5952
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 7f99f183c055dbb657a896adb568687b6264df44)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/demux/avi/avi.c

@@ -530,7 +530,7 @@ static int Open( vlc_object_t * p_this )
                 fmt.video.i_frame_rate = tk->i_rate;
                 fmt.video.i_frame_rate_base = tk->i_scale;
                 fmt.i_extra =
-                    __MIN( p_vids->p_bih->biSize - sizeof( VLC_BITMAPINFOHEADER ),
+                    __MAX( p_vids->p_bih->biSize - sizeof( VLC_BITMAPINFOHEADER ),
                            p_vids->i_chunk_size - sizeof(VLC_BITMAPINFOHEADER) );
                 if( fmt.i_extra > 0 )
                 {