ssi: Convert legacy SSI_BUS -> BUS casts

Remove two legacy ->qbus style casts from TYPE_SSI_BUS to TYPE_BUS in
ssi.c.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
[AF: Convert one missing ->qbus and rename parent field]
Signed-off-by: Andreas Färber <afaerber@suse.de>

hw/ssi/ssi.c

@@ -15,7 +15,7 @@
 #include "hw/ssi.h"
 
 struct SSIBus {
-    BusState qbus;
+    BusState parent_obj;
 };
 
 #define TYPE_SSI_BUS "SSI"
@@ -88,7 +88,7 @@ static const TypeInfo ssi_slave_info = {
 
 DeviceState *ssi_create_slave_no_init(SSIBus *bus, const char *name)
 {
-    return qdev_create(&bus->qbus, name);
+    return qdev_create(BUS(bus), name);
 }
 
 DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
@@ -108,11 +108,12 @@ SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
 
 uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
 {
+    BusState *b = BUS(bus);
     BusChild *kid;
     SSISlaveClass *ssc;
     uint32_t r = 0;
 
-    QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+    QTAILQ_FOREACH(kid, &b->children, sibling) {
         SSISlave *slave = SSI_SLAVE(kid->child);
         ssc = SSI_SLAVE_GET_CLASS(slave);
         r |= ssc->transfer_raw(slave, val);
@@ -156,7 +157,7 @@ static int ssi_auto_connect_slave(Object *child, void *opaque)
     }
 
     cs_line = qdev_get_gpio_in(DEVICE(dev), 0);
-    qdev_set_parent_bus(DEVICE(dev), &arg->bus->qbus);
+    qdev_set_parent_bus(DEVICE(dev), BUS(arg->bus));
     **arg->cs_linep = cs_line;
     (*arg->cs_linep)++;
     return 0;