KVM: x86: Clean up: remove redundant bool conversions

As test_bit() returns bool, explicitly converting result to bool is
unnecessary. Get rid of '!!'.

No functional change intended.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://lore.kernel.org/r/20230605200158.118109-1-mhal@rbox.co


Signed-off-by: Sean Christopherson <seanjc@google.com>