core: allow omitting @src argument in nm_utils_ip6_address_clear_host_address()
For convenience, to clear the address inplace, allow to leave @src NULL, instead of requiring to set @src to @dst. The only problem is, if you make use of this extended behavior and later backport the use to an older branch, ensure that you cherry-pick this commit too. That is easy to miss, but you are testing the backport, right?
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