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commit 403dff4e upstream.

We need to check that we have both a valid data and control inteface for both
types of headers (union and not union.)

References: https://bugzilla.kernel.org/show_bug.cgi?id=83551

Reported-by: Simon Schubert <2+kernel@0x2c.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>