bin/105614: [patch] setkey(8): Creating NULL encryption ESP SAs with setkey fails

[John W. O'Brien]

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I found today that this bug still exists in 9.1-STABLE r245089, and
that the suggested patch appears to fix it.

If any further testing or analysis is needed prior to committing a
fix, I would be glad to help.

CC: freebsd-net@ in the hopes of being noticed and adopted
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