hw/char: QOM'ify escc.c (fix)

The previous commit e7c91369
(hw/char: QOM'ify escc.c) cause qemu-system-ppc/ppc64
OpenBIOS to freeze on startup, this commit fix it.
Signed-off-by: Nxiaoqiang zhao <zxq_yx_007@163.com>
Tested-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <1464767898-30526-1-git-send-email-zxq_yx_007@163.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/char/escc.c

@@ -989,18 +989,13 @@ static void escc_init1(Object *obj)
     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
     unsigned int i;
 
-    s->chn[0].disabled = s->disabled;
-    s->chn[1].disabled = s->disabled;
     for (i = 0; i < 2; i++) {
         sysbus_init_irq(dev, &s->chn[i].irq);
         s->chn[i].chn = 1 - i;
-        s->chn[i].clock = s->frequency / 2;
     }
     s->chn[0].otherchn = &s->chn[1];
     s->chn[1].otherchn = &s->chn[0];
 
-    memory_region_init_io(&s->mmio, obj, &escc_mem_ops, s, "escc",
-                          ESCC_SIZE << s->it_shift);
     sysbus_init_mmio(dev, &s->mmio);
 }
 
@@ -1009,8 +1004,15 @@ static void escc_realize(DeviceState *dev, Error **errp)
     ESCCState *s = ESCC(dev);
     unsigned int i;
 
+    s->chn[0].disabled = s->disabled;
+    s->chn[1].disabled = s->disabled;
+
+    memory_region_init_io(&s->mmio, OBJECT(dev), &escc_mem_ops, s, "escc",
+                          ESCC_SIZE << s->it_shift);
+
     for (i = 0; i < 2; i++) {
         if (s->chn[i].chr) {
+            s->chn[i].clock = s->frequency / 2;
             qemu_chr_add_handlers(s->chn[i].chr, serial_can_receive,
                                   serial_receive1, serial_event, &s->chn[i]);
         }