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Currently messages like "Writing flash chip..." that don't end with
a newline are buffered until the operation is complete, unless the
particular write function generates status output in the meantime.

Flushing stdout after each message ensures that the message appears
immediately.

Corresponding to flashrom svn r1349.
Signed-off-by: Ed Swierk <eswierk@aristanetworks.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>