[Bug 213361] ipsec traffic generates esp_output logs for no apparent reason

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213361

            Bug ID: 213361
           Summary: ipsec traffic generates esp_output logs for no
                    apparent reason
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emre at gundogan.us
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

On a recently upgraded (10.3-RELEASE-p5 -> 11.0-RELEASE-p1) machine (amd64),
I've noticed a barrage of 'esp_output: skip 20 hlen 24 ...' lines in log while
there is traffic on an ipsec connection. Due to a change in
sys/netipsec/xform_esp.c (DPRINTF on line 723), a log is generated with each
packet in my case. This wasn't true in 10.3-p5, and it looks like perhaps that
DPRINTF line shouldn't be there? Both the client and the server are FreeBSD
11-p1 machines (both just upgraded).

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