d8af104fb0
Fixes a regression caused by d307410327.
The link_mode_masks flex array in struct ethtool_link_settings contains
three packed arrays, and the length of each array is given by
link_mode_masks_nwords field:
```
__u32 link_mode_masks[];
/* layout of link_mode_masks fields:
* __u32 map_supported[link_mode_masks_nwords];
* __u32 map_advertising[link_mode_masks_nwords];
* __u32 map_lp_advertising[link_mode_masks_nwords];
*/
```
Hence, we cannot use the received data as is through the union, but need
to shift the array to make each map accessible through the union.
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