[2.28 COMMITTED] Fix tzfile low-memory assertion failure

[Carlos O'Donell]

Tested on x86_64. build-many-glibcs run in progress.
--
[BZ #21716]
* time/tzfile.c (__tzfile_read): Check for memory exhaustion
when registering time zone abbreviations.

(cherry picked from commit e4e4fde51a309801af5eed72d3494cbf4b7737aa)
---
 ChangeLog     | 7 +++++++
 time/tzfile.c | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

-- 
Cheers,
Carlos.
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