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 <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/powerpc/kvm/book3s_xive.c

···
 		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;
 	}