[PATCH] posix: Fix -Warray-bounds instances building timer_create [BZ #26687]

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

> This patch fixes both issues by embedding the information whether
> the timer if a SIGEV_THREAD in the returned 'timer_t'.  For
> !SIGEV_THREAD, the resulting 'timer_t' is the returned kernel timer
> identifer (kernel_timer_t), while for SIGEV_THREAD it uses the fact
> malloc returns at least _Alignof (max_align_t) pointers plus that
> valid kernel_timer_t are always positive to set MSB bit of the returned
> 'timer_t' to indicate the timer handles a SIGEV_THREAD.

LSB, not MSB, right?

Thanks,
Florian
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