D51118.diff
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	diff --git a/lib/libc/gen/opendir2.c b/lib/libc/gen/opendir2.c
	--- a/lib/libc/gen/opendir2.c
	+++ b/lib/libc/gen/opendir2.c
	@@ -243,20 +243,18 @@
	return (true);
	}

	+/*
	+ * Return true if the file descriptor is associated with a file from a
	+ * union file system or from a file system mounted with the union flag.
	+ */
	static bool
	is_unionstack(int fd)
	{
	- int unionstack;
	-
	- unionstack = _fcntl(fd, F_ISUNIONSTACK, 0);
	- if (unionstack != -1)
	- return (unionstack);
	-
	/*
	- * Should not happen unless running on a kernel without the op,
	- * but no use rendering the system useless in such a case.
	+ * This call shouldn't fail, but if it does, just assume that the
	+ * answer is no.
	*/
	- return (0);
	+ return (_fcntl(fd, F_ISUNIONSTACK, 0) > 0);
	}

	/*