rpipico: memory corruption about fuzix HOT 2 CLOSED

--- a/Applications/util/ps.c
+++ b/Applications/util/ps.c
@@ -472,7 +472,9 @@ int do_ps(void)
                        close(pfd);
                        return 1;
                }
-               ppid_slot[i] = ptab[i].p_tab.p_pptr - ptab[0].p_tab.p_pptr;
+               /* Work out which slot is referenced from the node size as our own ptab struct
+                  may not exactly size match the kernel */
+               ppid_slot[i] = ((uint8_t *)ptab[i].p_tab.p_pptr - (uint8_t *)ptab[0].p_tab.p_pptr) / nodesize;
                /* Learn our tty internal reference as we go */
                if (ptab[i].p_tab.p_status && ptab[i].p_tab.p_pid == pid)
                        tty = ptab[i].p_tab.p_tty;