main-loop: remove now unnecessary optimization
This optimization is not necessary anymore, because the vCPU now drops the I/O thread lock even with TCG. Drop it to simplify the code and avoid the "I/O thread spun for 1000 iterations" warning. Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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