accel/kvm/kvm-all: Fixes the missing break in vCPU unpark logic

accel/kvm/kvm-all: Fixes the missing break in vCPU unpark logic

Loop should exit prematurely on successfully finding out the parked vCPU (struct
KVMParkedVcpu) in the 'struct KVMState' maintained 'kvm_parked_vcpus' list of
parked vCPUs.

Fixes: Coverity CID 1558552
Fixes: 08c3286822 ("accel/kvm: Extract common KVM vCPU {creation,parking} code")
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-id: 20240725145132.99355-1-salil.mehta@huawei.com
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <CAFEAcA-3_d1c7XSXWkFubD-LsW5c5i95e6xxV09r2C9yGtzcdA@mail.gmail.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>