Comment 5 for bug 1701316

We've received a patch from Huawei which is said to fix this issue. The patch is an obviously correct fix, so I've applied it to artful. I'll provide a test build shortly for zesty.

Also will backport to yakkety, since there's potential for bugs there as well. Xenial is unaffected because the code paths in question are only relevant to 4.8 and later (I mistakenly nominated this for xenial, will mark that invalid).