[Bug 238309] geom/geom_slice.c: potential NULL pointer dereference in g_slice_dumpconf()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238309

            Bug ID: 238309
           Summary: geom/geom_slice.c: potential NULL pointer dereference
                    in g_slice_dumpconf()
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: danfe at FreeBSD.org

PVS Studio reports: /usr/src/sys/geom/geom_slice.c:339:1: error: V595 The 'pp'
pointer was utilized before it was verified against nullptr. Check lines: 339,
342.

>        if (indent == NULL) {
>                sbuf_printf(sb, " i %u", pp->index);
>                sbuf_printf(sb, " o %ju",
>                    (uintmax_t)gsp->slices[pp->index].offset);
>                return;
>        }
>        if (pp != NULL) {
>                sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index);
>                ...

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