stdlib: Fixup mbstowcs NULL __dst handling. [BZ #29279]
commit 464d189b (origin/master, origin/HEAD) Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Wed Jun 22 08:24:21 2022 -0700 stdlib: Remove attr_write from mbstows if dst is NULL [BZ: 29265] Incorrectly called `__mbstowcs_chk` in the NULL __dst case which is incorrect as in the NULL __dst case we are explicitly skipping the objsize checks. As well, remove the `__always_inline` attribute which exists in `__fortify_function`. Reviewed-by:Siddhesh Poyarekar <siddhesh@sourceware.org> (cherry picked from commit 220b83d8)
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