KVM: x86: Clean up directed yield API for "has pending interrupt"

Directly return the boolean result of whether or not a vCPU has a pending
interrupt instead of effectively doing:

  if (true)
	return true;

  return false;

Reviewed-by: Yuan Yao <yuan.yao@intel.com>
Link: https://lore.kernel.org/r/20240110003938.490206-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/x86.c

@@ -13046,11 +13046,8 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
 
 bool kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu)
 {
-	if (kvm_vcpu_apicv_active(vcpu) &&
-	    static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu))
-		return true;
-
-	return false;
+	return kvm_vcpu_apicv_active(vcpu) &&
+	       static_call(kvm_x86_dy_apicv_has_pending_interrupt)(vcpu);
 }
 
 bool kvm_arch_vcpu_preempted_in_kernel(struct kvm_vcpu *vcpu)