KVM: selftests: Return an 'unsigned int' from kvm_check_cap()
Return an 'unsigned int' instead of a signed 'int' from kvm_check_cap(), to make it more obvious that kvm_check_cap() can never return a negative value due to its assertion that the return is ">= 0". Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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