Make sure any errors that occur within the macfb realize chain are detected
and handled correctly to prevent crashes and to ensure that error messages are
reported back to the user.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
 hw/display/macfb.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hw/display/macfb.c b/hw/display/macfb.c
index 76808b69cc..2b747a8de8 100644
--- a/hw/display/macfb.c
+++ b/hw/display/macfb.c
@@ -379,6 +379,10 @@ static void macfb_sysbus_realize(DeviceState *dev, Error **errp)
     MacfbState *ms = &s->macfb;
 
     macfb_common_realize(dev, ms, errp);
+    if (*errp) {
+        return;
+    }
+
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &ms->mem_ctrl);
     sysbus_init_mmio(SYS_BUS_DEVICE(s), &ms->mem_vram);
 }
@@ -391,8 +395,15 @@ static void macfb_nubus_realize(DeviceState *dev, Error **errp)
     MacfbState *ms = &s->macfb;
 
     ndc->parent_realize(dev, errp);
+    if (*errp) {
+        return;
+    }
 
     macfb_common_realize(dev, ms, errp);
+    if (*errp) {
+        return;
+    }
+
     memory_region_add_subregion(&nd->slot_mem, DAFB_BASE, &ms->mem_ctrl);
     memory_region_add_subregion(&nd->slot_mem, VIDEO_BASE, &ms->mem_vram);
 }
-- 
2.20.1