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If error happens, don't overwrite original errno comes from __mbrtowc()

Description

If error happens, don't overwrite original errno comes from mbrtowc()
and
srefill().

MFC after: 3 days

Details

Provenance
acheAuthored on Sep 1 2016, 6:12 PM
Parents
rG1dc088ab6981: Pull in r277331 from upstream llvm trunk (by Diana Picus):
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