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Bug 17657 - function may return address of local variable
https://sourceware.org/bugzilla/show_bug.cgi?id=17657

We should backport this to fix the bug and fix the compiler warnings, and static analysis warnings.

commit 363a98991884a744e78b9bfc7df89768901c0816
Author: Ondřej Bílka <neleai>
Date:   Tue Dec 16 00:09:32 2014 +0100

    Return allocated array instead of unallocated.
    
    In locale/programs/ld-ctype.c we returned array that was on stack.
    Fixed by returning static array instead.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:3092