Do not write junk in the end of truncated files. FATE

ra144 test will probably need to be updated.

Originally committed as revision 13839 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/ra144.c

@@ -343,6 +343,7 @@ static int ra144_decode_frame(AVCodecContext * avctx,
     if(buf_size < 20) {
         av_log(avctx, AV_LOG_ERROR,
                "Frame too small (%d bytes). Truncated file?\n", buf_size);
+        *data_size = 0;
         return buf_size;
     }
     init_get_bits(&gb, buf, 20 * 8);