In last 15 years nanddump changed its command line arguments. Argument -b
(omit bad blocks) was completely removed and argument -o (omit oob data)
changed its meaning to "include" oob data. So for compatibility with all
nanddump versions, do not use argument -b and instead of -o use argument
--omitoob which is present in all nanddump versions and has same meaning
to omit oob data.
This change should fix dumping firmware files on devices with recent
versions of nanddump.
Pali Rohár