[Bug 245463] Driver sysctl tunables that use strings fail with error 14

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245463

            Bug ID: 245463
           Summary: Driver sysctl tunables that use strings fail with
                    error 14
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jeffrey.e.pieper at intel.com

When changing driver tunables that use strings with kenv, they fail with error
14. For example Intel drivers rx/tx descriptor tunables fail with:

Setting sysctl dev.ixl.0.iflib.override_ntxds failed: 14
Setting sysctl dev.ixl.0.iflib.override_nrxds failed: 14

More than likely this is caused by https://reviews.freebsd.org/D23378. This
patch has made changes to the sysctl_handle_string() function. The copyin()
function  is now used to copy bytes from user space to kernel space. The
problem is that the tunables are already located in the kernel space (kenv). It
turns out that changing string parameters using sysctl works well, but if you
set string parameters from kenv, the copyin() function fails with error 14.

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