In case allocation fails, we must behave correctly and exit with error.

Fixes: e6b817d4 ("vfio-pci/zdev: Add zPCI capabilities to VFIO_DEVICE_GET_INFO")
Signed-off-by: NMax Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Reviewed-by: NMatthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>