hw/nvram/fw_cfg: Use memberwise copy of MemoryRegionOps struct

We've now removed the 'old_mmio' member from MemoryRegionOps,
so we can perform the copy as a simple struct copy rather
than having to do it via a memberwise copy.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20180824170422.5783-3-peter.maydell@linaro.org>
Based-on: <20180802174042.29234-1-peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/nvram/fw_cfg.c

@@ -1115,12 +1115,7 @@ static void fw_cfg_mem_realize(DeviceState *dev, Error **errp)
     sysbus_init_mmio(sbd, &s->ctl_iomem);
 
     if (s->data_width > data_ops->valid.max_access_size) {
-        /* memberwise copy because the "old_mmio" member is const */
-        s->wide_data_ops.read       = data_ops->read;
-        s->wide_data_ops.write      = data_ops->write;
-        s->wide_data_ops.endianness = data_ops->endianness;
-        s->wide_data_ops.valid      = data_ops->valid;
-        s->wide_data_ops.impl       = data_ops->impl;
+        s->wide_data_ops = *data_ops;
 
         s->wide_data_ops.valid.max_access_size = s->data_width;
         s->wide_data_ops.impl.max_access_size  = s->data_width;