dmaengine: fsl-edma: Fix clk leak on alloc_chan_resources failure

When fsl_edma_alloc_chan_resources() fails after clk_prepare_enable(),
the error paths only free IRQs and destroy the TCD pool, but forget to
call clk_disable_unprepare(). This causes the channel clock to remain
enabled, leaking power and resources.

Fix it by disabling the channel clock in the error unwind path.

Fixes: d8d4355 ("dmaengine: fsl-edma: add i.MX8ULP edma support")
Cc: [email protected]
Suggested-by: Frank Li <[email protected]>
Signed-off-by: Zhen Ni <[email protected]>
Reviewed-by: Frank Li <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: nizhen-t

drivers/dma/fsl-edma-common.c

@@ -873,6 +873,7 @@ int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
 		free_irq(fsl_chan->txirq, fsl_chan);
 err_txirq:
 	dma_pool_destroy(fsl_chan->tcd_pool);
+	clk_disable_unprepare(fsl_chan->clk);
 
 	return ret;
 }