spi: cadence-quadspi: fix cleanup of rx_chan on failure paths

Remove incorrect checks on cqspi->rx_chan that cause driver breakage
during failure cleanup. Ensure proper resource freeing on the success
path when operating in cqspi->use_direct_mode, preventing leaks and
improving stability.

Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@altera.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/89765a2b94f047ded4f14babaefb7ef92ba07cb2.1751274389.git.khairul.anuar.romli@altera.com


Signed-off-by: Mark Brown <broonie@kernel.org>