K 10
svn:author
V 4
ache
K 8
svn:date
V 27
2016-08-27T10:00:36.607353Z
K 7
svn:log
V 275
MFC r304810

Don't check for __SERR which may stick from one of any previous stdio
functions.
__SERR is for user and the rest of stdio code do not check it
for error sensing internally, only set it.
In vf(w)printf.c here it is more easy to save __SERR, clear and restore it.

END