[Bug 216342] psm: wrong calculation for clickpad softbuttons at the top

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216342

            Bug ID: 216342
           Summary: psm: wrong calculation for clickpad softbuttons at the
                    top
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology

Created attachment 179180
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179180&action=edit
patch

On laptops like the ThinkPad X240, ClickPad buttons are located at the top. The
hw.psm.synaptics.softbuttons_y sysctl was supposed to allow this by setting the
value to a negative one (e.g. -1700). However, the condition was wrong (double
negative), and doing that placed the buttons in an unreachable area. This patch
fixes that problem.

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