legacy_acpi_cpu_plug_cb() dereferences @errp when
acpi_set_cpu_present_bit() fails.  That's wrong; see the big comment
in error.h.  Introduced in commit cc43364de7 "acpi/cpu-hotplug:
introduce helper function to keep bit setting in one place".

No caller actually passes null, and acpi_set_cpu_present_bit() can't
actually fail.

Fix anyway: drop acpi_set_cpu_present_bit()'s @errp parameter.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20191204093625.14836-7-armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/acpi/cpu_hotplug.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/hw/acpi/cpu_hotplug.c b/hw/acpi/cpu_hotplug.c
index 3ac2045a95..9c3bcc84de 100644
--- a/hw/acpi/cpu_hotplug.c
+++ b/hw/acpi/cpu_hotplug.c
@@ -55,8 +55,7 @@ static const MemoryRegionOps AcpiCpuHotplug_ops = {
     },
 };
 
-static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
-                                     Error **errp)
+static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu)
 {
     CPUClass *k = CPU_GET_CLASS(cpu);
     int64_t cpu_id;
@@ -74,10 +73,7 @@ static void acpi_set_cpu_present_bit(AcpiCpuHotplug *g, CPUState *cpu,
 void legacy_acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
                              AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
 {
-    acpi_set_cpu_present_bit(g, CPU(dev), errp);
-    if (*errp != NULL) {
-        return;
-    }
+    acpi_set_cpu_present_bit(g, CPU(dev));
     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 }
 
@@ -92,7 +88,7 @@ void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
     gpe_cpu->device = owner;
 
     CPU_FOREACH(cpu) {
-        acpi_set_cpu_present_bit(gpe_cpu, cpu, &error_abort);
+        acpi_set_cpu_present_bit(gpe_cpu, cpu);
     }
 }
 
-- 
2.21.0