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If open() fails it returns -1. Calling close() with this value makes no sense. Return -EIO instead. Addresses-Coverity-ID: 185828 Improper use of negative value Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Fixes: 566bf3a8698 ("sandbox: Add a function to read a host file") Reviewed-by: Sean Anderson <seanga2@gmail.com>