mss1: report palette changed when some additional colours were decoded

diff --git a/libavcodec/mss1.c b/libavcodec/mss1.c
index 9527374..062cf3a 100644 (file)
--- a/libavcodec/mss1.c
+++ b/libavcodec/mss1.c
@@ -557,7 +557,7 @@ static int decode_pal(MSS1Context *ctx, ArithCoder *acoder)
         *pal++ = (r << 16) | (g << 8) | b;
     }
 
-    return 0;
+    return !!ncol;
 }
 
 static int decode_pivot(MSS1Context *ctx, ArithCoder *acoder, int base)