spi: atcspi200: Fix double-free in atcspi_configure_dma()

spi: atcspi200: Fix double-free in atcspi_configure_dma()

The driver uses devm_dma_request_chan() which registers automatic cleanup
via devm_add_action_or_reset(). Calling dma_release_channel() manually on
the RX channel when TX channel request fails causes a double-free when
the devm cleanup runs.

Remove the unnecessary manual cleanup and simplify the error handling
since devm will properly release channels on probe failure or driver
detach.

Fixes: 34e3815ea459 ("spi: atcspi200: Add ATCSPI200 SPI controller driver")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Link: https://patch.msgid.link/20260305-atcspi2000-v1-1-eafe08dcca60@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>