K 10
svn:author
V 4
ache
K 8
svn:date
V 27
2016-08-22T15:44:54.848983Z
K 7
svn:log
V 308
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

END