spl: nand: sunxi: fix second case of modulo by zero error

spl: nand: sunxi: fix second case of modulo by zero error

In the nand_read_buffer() step, the seed is calculated by doing a modulo
by conf->nseeds which is always zero when not using the randomizer (most
of SLC NANDs).

This situation turns out to lead to a run time freeze with certain
toolchains.

Derive this seed only when the randomizer is enabled (and conf->nseeds
logically not zero), exactly like what has been done before with an
identical situation, see commit ea3f750c73e3 ("nand: sunxi: Fix modulo
by zero error").

Signed-off-by: Miquel Raynal <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>