libc: Restore fp state upon flush error in fputc
This is akin to commit bafaa70b6f9098d83d074968c8e6747ecec1e118.
Reported by: Guy Yur <guyyur@gmail.com>
Fixes: 86a16ada1ea6
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
libc: Restore fp state upon flush error in fputc Tags None Referenced Files None Subscribers None
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