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René Scharfe ec6cd14c7a cocci: detect useless free(3) calls

Add a semantic patch for removing checks that cause free(3) to only be
called with a NULL pointer, as that must be a programming mistake.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2017-02-11 11:29:12 -08:00

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 @@
 expression E;
 @@
 - if (E)
   free(E);
 @@
 expression E;
 @@
 - if (!E)
   free(E);