While the local stack pointers could be thought of as "only"
numbers that are not invalidated by the memory they point at
being freed, any use of the pointer after the free is undefined
and so warned about (at best).
gcc version 12.2.1 20220819 (Red Hat 12.2.1-1) (GCC)
Signed-off-by: Andrew Bartlett <abartlet@samba.org>