[Bug c/71157] -Wnull-dereference false alarm in wrong function

[eggert at gnu dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71157

--- Comment #3 from Paul Eggert <eggert at gnu dot org> ---
Created attachment 38532
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38532&action=edit
patched version of e.i that avoids GCC bug