mtd: rawnand: cafe: Fix a resource leak in the error handling path of 'cafe_nand_probe()'

A successful 'init_rs_non_canonical()' call should be balanced by a
corresponding 'free_rs()' call in the error handling path of the probe, as
already done in the remove function.

Update the error handling path accordingly.

Fixes: 8c61b7a7

 ("[MTD] [NAND] Use rslib for CAFÉ ECC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/fd313d3fb787458bcc73189e349f481133a2cdc9.1629532640.git.christophe.jaillet@wanadoo.fr