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The "err" variable was declared but never used within the chr_closed_bh() function. This resulted in a dead code warning (CID 1612365) from Coverity. Remove the unused variable and the associated error block to resolve the issue. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Jason Wang <jasowang@redhat.com>