dmaengine: sh: Discard pm_runtime_put() return value

Clobbering an error value to be returned from shdma_tx_submit() with
a pm_runtime_put() return value is not particularly useful, especially
if the latter is 0, so stop doing that.

This will facilitate a planned change of the pm_runtime_put() return
type to void in the future.

Signed-off-by: Rafael J. Wysocki <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/sh/shdma-base.c

···
 				}
 
 				schan->pm_state = SHDMA_PM_ESTABLISHED;
-				ret = pm_runtime_put(schan->dev);
+				pm_runtime_put(schan->dev);
 
 				spin_unlock_irq(&schan->chan_lock);
 				return ret;