There is a typo in the error message displayed when VLC is unable to

find a correct blending module given input and output chromas. Instead
of displaying the input chroma and the output chroma in the error
message, it displays two times the output chroma.

This patch corrects the typo.
Signed-off-by: JP Dinger <jpd@videolan.org>

src/video_output/vout_subpictures.c

@@ -1581,7 +1581,7 @@ static void SpuRenderRegion( spu_t *p_spu,
                       p_region_picture, SpuRegionAlpha( p_subpic, p_region ) ) )
     {
         msg_Err( p_spu, "blending %4.4s to %4.4s failed",
-                 (char *)&p_sys->p_blend->fmt_out.video.i_chroma,
+                 (char *)&p_sys->p_blend->fmt_in.video.i_chroma,
                  (char *)&p_sys->p_blend->fmt_out.video.i_chroma );
     }