[Bug 268661] Accrete segfaults when it attempts to write to file without permissions

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268661

            Bug ID: 268661
           Summary: Accrete segfaults when it attempts to write to file
                    without permissions
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: eylusion@gmail.com
                CC: bofh@freebsd.org

Created attachment 239138
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239138&action=edit
git diff of display.c does null check before writing to fp

astro:accrete

display.c

Segmentation Fault occurs if program is executed in a directory without write
privileges.

Patch provided exits gracefully if *fp is NULL before fprintf's attempt to
write to non-existent file.

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