spi: cadence-quadspi: Fix error return code in cqspi_probe

spi: cadence-quadspi: Fix error return code in cqspi_probe

Fix to return the error code from
devm_reset_control_get_optional_exclusive() instaed of 0
in cqspi_probe().

Fixes: 31fb632b5d43ca ("spi: Move cadence-quadspi driver to drivers/spi/")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20201116141836.2970579-1-chengzhihao1@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>