wtvenc: output ff_format_none if ff_put_wav_header fails

This occurs when muxing E-AC-3.
Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/wtvenc.c

@@ -298,7 +298,8 @@ static int write_stream_codec_info(AVFormatContext *s, AVStream *st)
     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
         put_videoinfoheader2(pb, st);
     } else {
-        ff_put_wav_header(pb, st->codec);
+        if (ff_put_wav_header(pb, st->codec) < 0)
+            format_type = &ff_format_none;
     }
     hdr_size = avio_tell(pb) - hdr_pos_start;