KVM: vgic: return int instead of bool when checking I/O ranges

KVM: vgic: return int instead of bool when checking I/O ranges

vgic_ioaddr_overlap claims to return a bool, but in reality it returns
an int. Shut sparse up by fixing the type signature.

Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
(cherry picked from commit 1fa451bcc67fa921a04c5fac8dbcde7844d54512)
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>