dmaengine: fsldma: fix memory leak

adding unmap of sources and destinations while doing dequeue.

Signed-off-by: Xuelin Shi <xuelin.shi@nxp.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 2209f75..aac85c3 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -522,6 +522,8 @@
 			chan_dbg(chan, "LD %p callback\n", desc);
 			txd->callback(txd->callback_param);
 		}
+
+		dma_descriptor_unmap(txd);
 	}
 
 	/* Run any dependencies */