asfenc: start at object 1 instead of 0

This is how it is done in the official muxer.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/asfenc.c

@@ -400,7 +400,7 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
 
         enc = s->streams[n]->codec;
         asf->streams[n].num = n + 1;
-        asf->streams[n].seq = 0;
+        asf->streams[n].seq = 1;
 
 
         switch(enc->codec_type) {

tests/ref/lavf/asf

-e60b298a4db9bcedaabaaee9f90d2a42 *./tests/data/lavf/lavf.asf
+e2ee0e05f020adb0aa84202a60211790 *./tests/data/lavf/lavf.asf
 333489 ./tests/data/lavf/lavf.asf
 ./tests/data/lavf/lavf.asf CRC=0x9f5ab3e6