ache fbe7b3bf6b Fix error processing.
1) Don't forget to set __SERR on __slbexpand() error.
2) Check for __fgetwc() errors using errno. Don't check for __SERR
as PR suggested, it user-visible flag which can stick from previous
functions and stdio code don't check it for this purpose.

PR:     212033
MFC after:      3 days
2016-08-22 15:44:54 +00:00
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