acpi/ipmi: Initialize the fwinfo before fetching it

The initialization was missed before, resulting in some
bad data in the smbus case.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/ipmi.c

@@ -99,6 +99,7 @@ void build_acpi_ipmi_devices(Aml *scope, BusState *bus)
 
         ii = IPMI_INTERFACE(obj);
         iic = IPMI_INTERFACE_GET_CLASS(obj);
+        memset(&info, 0, sizeof(info));
         iic->get_fwinfo(ii, &info);
         aml_append(scope, aml_ipmi_device(&info));
     }