nand: davinci: avoid out of bounds array access

The array bounds have to be checked before accessing the array element.

Identified by cppcheck.

Fixes: 67ac6ffaeefb ("mtd: nand: davinci: add opportunity to write keystone U-boot image")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
1 file changed