mtd: rawnand: nandsim: Manage lists on error in ns_init_module()

Lists are filled with calls to ns_parse_weakblocks(),
ns_parse_weakpages() and ns_parse_gravepages(). Handle them in the
error path, all at the same time.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200525085851.17682-16-miquel.raynal@bootlin.com