spi: stm32-ospi: Fix DMA channel leak on stm32_ospi_dma_setup() failure

When stm32_ospi_dma_setup() fails, the DMA channels allocated by
stm32_ospi_get_resources() were never released. Add proper cleanup
in the error path.

Fixes: e35a760 ("spi: stm32-ospi: Set DMA maxburst dynamically")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://patch.msgid.link/20260329-stm32-ospi-v1-2-142122466412@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: outman119

drivers/spi/spi-stm32-ospi.c

@@ -928,7 +928,7 @@ static int stm32_ospi_probe(struct platform_device *pdev)
 	dma_cfg.dst_addr = ospi->regs_phys_base + OSPI_DR;
 	ret = stm32_ospi_dma_setup(ospi, &dma_cfg);
 	if (ret)
-		return ret;
+		goto err_dma_free;
 
 	mutex_init(&ospi->lock);
 
@@ -980,6 +980,7 @@ static int stm32_ospi_probe(struct platform_device *pdev)
 err_pm_enable:
 	pm_runtime_force_suspend(ospi->dev);
 	mutex_destroy(&ospi->lock);
+err_dma_free:
 	if (ospi->dma_chtx)
 		dma_release_channel(ospi->dma_chtx);
 	if (ospi->dma_chrx)