Merge branch 'raw_probe_proto_opt'

Herbert Xu says:

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ipv4: Simplify raw_probe_proto_opt and avoid reading user iov twice

This series rewrites the function raw_probe_proto_opt in a more
readable fasion, and then fixes the long-standing bug where we
read the probed bytes twice which means that what we're using to
probe may in fact be invalid.
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Signed-off-by: David S. Miller <davem@davemloft.net>