[Bug 275646] security/samhain: don't use sbrk

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275646

            Bug ID: 275646
           Summary: security/samhain: don't use sbrk
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: brooks@FreeBSD.org
                CC: freebsd@gregv.net
                CC: freebsd@gregv.net
             Flags: maintainer-feedback?(freebsd@gregv.net)

Created attachment 246920
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246920&action=edit
patch to remove sbrk use

Samhain has an internal malloc implementation that uses sbrk and malloc. 
There's a fallback during initialization if sbrk fails so replace sbrk calls
with a function that return the failure value ((void *)-1).

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