Merge branch 'bpf-prog-digest'

Daniel Borkmann says:

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Minor BPF cleanups and digest

First two patches are minor cleanups, and the third one adds
a prog digest. For details, please see individual patches.
After this one, I have a set with tracepoint support that makes
use of this facility as well.
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Signed-off-by: David S. Miller <davem@davemloft.net>