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ivfclose: be safer, set stuff to nil to support repeated calls

--- a/decoder_h264.c

+++ b/decoder_h264.c

@@ -164,15 +164,15 @@

 	Streamframe sf;

 	Aux *a;

 	int res, w, h, *stride;

-	uvlong start;

+	uvlong start, framenum;

 	d = x;

 	a = d->aux;

 	lasttimestamp = 0;

 	start = nanosec();

-	for(res = 0; res >= 0 && (res = Sread(d->s, &sf)) == 0 && sf.sz > 0;){

+	for(res = 0, framenum = 0; res >= 0 && (res = Sread(d->s, &sf)) == 0 && sf.sz > 0; framenum++){

 		if((res = WelsDecodeBs(&a->ctx, sf.buf, sf.sz, a->data, &a->info, nil)) != 0){

-			werrstr("WelsDecodeBs: error %#x", res);

+			werrstr("frame %llud: decoder error %#x", framenum, res);

 			break;

 		}

 		if(a->info.iBufferStatus == 0)

--- a/stream_ivf.c

+++ b/stream_ivf.c

@@ -172,8 +172,12 @@

 static void

 ivfclose(Stream *s)

 {

-	Bterm(s->b);

+	if(s->b != nil){

+		Bterm(s->b);

+		s->b = nil;

+	}

 	free(s->buf);

+	s->buf = nil;

 }

 Streamops ivfops = {