kern.mk: fix -Wno-error style to fix build with Clang 12
Clang 12 no longer supports -Wno-error-..., only the -Wno-error=...
style (which is already used everywhere else in the tree).
Differential Revision: https://reviews.freebsd.org/D29157
kern.mk: fix -Wno-error style to fix build with Clang 12 Tags None Referenced Files None Subscribers None
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