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games/doom: avoid /dev/cursor fd leak into music process

--- a/sys/src/games/doom/i_sound.c

+++ b/sys/src/games/doom/i_sound.c

@@ -461,8 +461,7 @@

 		break;

 	case 0:

 		dup(mpfd[1], 1);

-		close(mpfd[1]);

-		close(mpfd[0]);

+		for(n=2; n<20; n++) close(n);

 		close(0);

 		snprint(name, sizeof(name), "/tmp/%s.mus", m->name);

 		if(create(name, ORDWR, 0666) != 0)