If spi_register_master() fails, we must undo a previous
mxic_spi_mem_ecc_probe() call, as already done in the remove function.

Fixes: 00360eba ("spi: mxic: Add support for pipelined ECC operations")
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/09c81f751241f6ec0bac7a48d4ec814a742e0d17.1648980664.git.christophe.jaillet@wanadoo.frSigned-off-by: NMark Brown <broonie@kernel.org>