Fix crash caused by division by zero for unknown flash chips

Corresponding to flashrom svn r232 and coreboot v2 svn r3309.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
1 file changed