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libtags: opus: fix duration on truncated files

--- a/sys/src/cmd/audio/libtags/opus.c

+++ b/sys/src/cmd/audio/libtags/opus.c

@@ -8,8 +8,7 @@

 	int sz, numtags, i, npages;

 	d = (uchar*)ctx->buf;

-	/* need to find vorbis frame with type=3 */

-	for(npages = 0; npages < 2; npages++){ /* vorbis comment is the second header */

+	for(npages = 0; npages < 2; npages++){

 		int nsegs;

 		if(ctx->read(ctx, d, 27) != 27)

 			return -1;

@@ -76,7 +75,7 @@

 				break;

 			for(; v != nil && v < ctx->buf+sz;){

 				v = memchr(v, 'O', ctx->buf+sz - v - 14);

-				if(v != nil && v[1] == 'g' && v[2] == 'g' && v[3] == 'S' && (v[5] & 4) == 4){ /* last page */

+				if(v != nil && v[1] == 'g' && v[2] == 'g' && v[3] == 'S'){

 					uvlong g = leuint(v+6) | (uvlong)leuint(v+10)<<32;

 					ctx->duration = g * 1000 / 48000; /* granule positions are always 48KHz */

 					return 0;