Init s->cdlms[][].recent to order - 1

Not sure if this is correct. But looks like
it was giving us off-by-one's when used to index
buffers.

libavcodec/wmalosslessdec.c

@@ -776,7 +776,7 @@ static void reset_codec(WmallDecodeCtx *s)
     s->mclms_recent = s->mclms_order * s->num_channels;
     for (ich = 0; ich < s->num_channels; ich++) {
         for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++)
-            s->cdlms[ich][ilms].recent = s->cdlms[ich][ilms].order;
+            s->cdlms[ich][ilms].recent = s->cdlms[ich][ilms].order - 1;
         /* first sample of a seekable subframe is considered as the starting of
            a transient area which is samples_per_frame samples long */
         s->channel[ich].transient_counter = s->samples_per_frame;