ichspi.c: make REGWRITE* macros safer

'+' does have a quite high precedence so "calling" those macros with a
term including weaker operators in the off parameter may have unexpected
consequences.

Corresponding to flashrom svn r1359.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
1 file changed