Re: build breakage due to br_multicast.c referencing ipv6_dev_get_saddr()

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> One unrelated other observation with this change of yours:
> daddr is an input argument to ipv6_dev_get_saddr(), yet
> it gets initialized only after the function was called. Is that
> really correct?
Hmm, that wasn't intentional. I tested that again and so far I still always
got the right source address. I had a little deeper look at ipv6_dev_get_saddr()
and seems like it could get racy the way it is now, so I'm attaching a patch
for that. Thanks for reporting, Jan.

And I hope I didn't cause too much inconvience with the build breakage,
didn't think of testing BRIDGE=y and IPV6=m.

Cheers, Linus
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