sd/pxa2xx_mmci: Don't crash on pxa2xx_mmci_init() error

On error, pxa2xx_mmci_init() reports to stderr and returns NULL.
Callers don't check for errors.  Machines akita, borzoi, mainstone,
spitz, terrier, tosa, and z2 crash shortly after, like this:

    $ qemu-system-aarch64 -M akita -drive if=sd,readonly=on
    qemu-system-aarch64: failed to init SD card: Cannot use read-only drive as SD card
    Segmentation fault (core dumped)

Machines connex and verdex reach the check for orphaned drives first:

    $ aarch64-softmmu/qemu-system-aarch64 -M connex -drive if=sd,readonly=on -accel qtest
    qemu-system-aarch64: failed to init SD card: Cannot use read-only drive as SD card
    qemu-system-aarch64: -drive if=sd,readonly=on: machine type does not support if=sd,bus=0,unit=0

Make pxa2xx_mmci_init() fail cleanly right away.

Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-arm@nongnu.org
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200622094227.1271650-16-armbru@redhat.com>

hw/sd/pxa2xx_mmci.c

@@ -18,7 +18,6 @@
 #include "hw/arm/pxa.h"
 #include "hw/sd/sd.h"
 #include "hw/qdev-properties.h"
-#include "qemu/error-report.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "trace.h"
@@ -483,7 +482,6 @@ PXA2xxMMCIState *pxa2xx_mmci_init(MemoryRegion *sysmem,
     DeviceState *dev, *carddev;
     SysBusDevice *sbd;
     PXA2xxMMCIState *s;
-    Error *err = NULL;
 
     dev = qdev_new(TYPE_PXA2XX_MMCI);
     s = PXA2XX_MMCI(dev);
@@ -496,16 +494,9 @@ PXA2xxMMCIState *pxa2xx_mmci_init(MemoryRegion *sysmem,
 
     /* Create and plug in the sd card */
     carddev = qdev_new(TYPE_SD_CARD);
-    qdev_prop_set_drive_err(carddev, "drive", blk, &err);
-    if (err) {
-        error_reportf_err(err, "failed to init SD card: ");
-        return NULL;
-    }
-    qdev_realize_and_unref(carddev, qdev_get_child_bus(dev, "sd-bus"), &err);
-    if (err) {
-        error_reportf_err(err, "failed to init SD card: ");
-        return NULL;
-    }
+    qdev_prop_set_drive_err(carddev, "drive", blk, &error_fatal);
+    qdev_realize_and_unref(carddev, qdev_get_child_bus(dev, "sd-bus"),
+                           &error_fatal);
 
     return s;
 }