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libc: use /fd instead of #d in iounit()

--- a/sys/src/libc/9sys/iounit.c

+++ b/sys/src/libc/9sys/iounit.c

@@ -12,7 +12,7 @@

 	int i, cfd;

 	char buf[128], *args[10];

-	snprint(buf, sizeof buf, "#d/%dctl", fd);

+	snprint(buf, sizeof buf, "/fd/%dctl", fd);

 	cfd = open(buf, OREAD|OCEXEC);

 	if(cfd < 0)

 		return 0;