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libtags: use nelem

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

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

@@ -65,7 +65,7 @@

 	ctx->found = 0;

 	ctx->format = Funknown;

 	res = -1;

-	for(i = 0; i < (int)(sizeof(g)/sizeof(g[0])); i++){

+	for(i = 0; i < nelem(g); i++){

 		ctx->num = 0;

 		if(g[i].f(ctx) == 0){

 			if(ctx->num > 0)

-- 

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