Free in avcodec_close() avctx->rc_eq. Fix a memory leak.

Originally committed as revision 14260 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/utils.c

@@ -973,6 +973,7 @@ int avcodec_close(AVCodecContext *avctx)
         avctx->codec->close(avctx);
     avcodec_default_free_buffers(avctx);
     av_freep(&avctx->priv_data);
+    av_freep(&avctx->rc_eq);
     avctx->codec = NULL;
     entangled_thread_counter--;
     return 0;