[Bug c/80528] reimplement gnulib's "useless-if-before-free" script as a compiler warning

[jim at meyering dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80528

jim at meyering dot net changed:

           What    |Removed                     |Added
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                 CC|                            |jim at meyering dot net

--- Comment #4 from jim at meyering dot net ---
Thanks for considering the addition. IME, the vast majority (probably "all I've
seen") of such "useless" if stmts have been attempts to avoid what used to be
UB/segfault on old systems, or simply due to people not realizing that
free(NULL) is now known to be ok on all reasonable portability targets.