selftests: add F_DUPDFD_QUERY selftests
Add simple selftests for the new F_DUPFD_QUERY fcntl().
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Add simple selftests for the new F_DUPFD_QUERY fcntl().
Signed-off-by: Christian Brauner <brauner@kernel.org>