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: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200622094227.1271650-16-armbru@redhat.com>

0 files changed, 0 insertions, 0 deletions