twinvq: consume block_align+1 packets as full ones

They can be produced by VQF.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavcodec/twinvq.c

@@ -523,6 +523,9 @@ int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
 
     *got_frame_ptr = 1;
 
+    // VQF can deliver packets 1 byte greater than block align
+    if (buf_size == avctx->block_align + 1)
+        return buf_size;
     return avctx->block_align;
 }