[PATCH] net: apple: bmac: Fix build since dev_addr constification

[Jakub Kicinski]

On Fri, 14 Jan 2022 14:13:16 +1100 Michael Ellerman wrote:
> Since commit adeef3e32146 ("net: constify netdev->dev_addr") the bmac
> driver no longer builds with the following errors (pmac32_defconfig):
> 
>   linux/drivers/net/ethernet/apple/bmac.c: In function ‘bmac_probe’:
>   linux/drivers/net/ethernet/apple/bmac.c:1287:20: error: assignment of read-only location ‘*(dev->dev_addr + (sizetype)j)’
>    1287 |   dev->dev_addr[j] = rev ? bitrev8(addr[j]): addr[j];
>         |                    ^
> 
> Fix it by making the modifications to a local macaddr variable and then
> passing that to eth_hw_addr_set().
> 
> We don't use the existing addr variable because the bitrev8() would
> mutate it, but it is already used unreversed later in the function.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>

Reviewed-by: Jakub Kicinski <kuba at kernel.org>

Thank you!