powerpc/xive: Assign boolean values to a bool variable

Fix the following coccicheck warnings:

./arch/powerpc/kvm/book3s_xive.c:1856:2-17: WARNING: Assignment of 0/1
to bool variable.

./arch/powerpc/kvm/book3s_xive.c:1854:2-17: WARNING: Assignment of 0/1
to bool variable.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1612680192-43116-1-git-send-email-jiapeng.chong@linux.alibaba.com

arch/powerpc/kvm/book3s_xive.c

@@ -1813,9 +1813,9 @@ int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
 		return -EINVAL;
 
 	if ((level == 1 && state->lsi) || level == KVM_INTERRUPT_SET_LEVEL)
-		state->asserted = 1;
+		state->asserted = true;
 	else if (level == 0 || level == KVM_INTERRUPT_UNSET) {
-		state->asserted = 0;
+		state->asserted = false;
 		return 0;
 	}