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doom: clean up temporary mus files

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

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

@@ -463,8 +463,8 @@

 		dup(mpfd[1], 1);

 		for(n=3; n<20; n++) close(n);

 		close(0);

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

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

+		snprint(name, sizeof(name), "/tmp/doom.%d", getpid());

+		if(create(name, ORDWR|ORCLOSE, 0666) != 0)

 			sysfatal("create: %r");

 		n = W_LumpLength(m->lumpnum);

 		if(write(0, m->data, n) != n)