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libtags/m4a: "gnre" is non-standard id3v1 style (non-text) - check before reading the value

--- a/sys/src/cmd/audio/libtags/m4a.c

+++ b/sys/src/cmd/audio/libtags/m4a.c

@@ -137,7 +137,7 @@

 			sz -= 4;

 			snprint((char*)d, ctx->bufsz, "%d", beuint(d));

 			txtcb(ctx, type, "", d);

-		}else if(type == Tgenre){

+		}else if(type == Tgenre && dtype != 1){

 			if(ctx->read(ctx, d, 2) != 2)

 				return -1;

 			sz -= 2;