hw/intc/arm_gicv3_its: downgrade error_report to warn_report in kvm_a…

…rm_its_reset

In scripts/arch-run.bash of kvm-unit-tests, it will check the qemu
output log with:
if [ -z "$(echo "$errors" | grep -vi warning)" ]; then

Thus without the warning prefix, all of the test fail.

Since it is not unrecoverable error in kvm_arm_its_reset for
current implementation, downgrading the report from error to
warn makes sense.

Signed-off-by: Jia He <jia.he@hxt-semitech.com>
Message-id: 1531969910-32843-1-git-send-email-jia.he@hxt-semitech.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/intc/arm_gicv3_its_kvm.c

@@ -211,7 +211,7 @@ static void kvm_arm_its_reset(DeviceState *dev)
         return;
     }
 
-    error_report("ITS KVM: full reset is not supported by the host kernel");
+    warn_report("ITS KVM: full reset is not supported by the host kernel");
 
     if (!kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_ITS_REGS,
                                GITS_CTLR)) {