qcelpdec: fix the return value of qcelp_decode_frame().
(cherry picked from commit 04c13dca8812e8302686887b6e8201d4ad25b7d8)
diff --git a/libavcodec/qcelpdec.c b/libavcodec/qcelpdec.c
index 59eff1f..3a18470 100644
--- a/libavcodec/qcelpdec.c
+++ b/libavcodec/qcelpdec.c
@@ -802,7 +802,7 @@
 
     *data_size = 160 * sizeof(*outbuffer);
 
-    return *data_size;
+    return buf_size;
 }
 
 AVCodec qcelp_decoder =