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The first byte of the flash chip was read at the start of the function
and later written back to address 0 if the flash chip was not identified
as SST28SF040, which means most of the time. This write caused corruption
of flash contents when verifying a SST49LF160C part.

Corresponding to flashrom svn r126 and coreboot v2 svn r2744.
Signed-off-by: Ed Swierk <eswierk@arastra.com>
Acked-by: Peter Stuge <peter@stuge.se>