[Bug malloc/17924] 'free' should not set errno

[bruno at clisp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17924

--- Comment #4 from Bruno Haible <bruno at clisp dot org> ---
I believe there is also another code path that can lead to free() setting
errno.

Namely, when glibc is not configured with --disable-experimental-malloc,
USE_TCACHE gets defined and enables this code path:
__libc_free -> malloc.c:3147 -> MAYBE_INIT_TCACHE -> malloc.c:3033 ->
tcache_init -> malloc.c:3007 -> _int_malloc -> malloc.c:3580 -> sysmalloc

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