dmaengine: fsldma: remove the unused variable

Fix the following build warning:
  drivers/dma/fsldma.c: In function 'fsl_dma_device_terminate_all':
  drivers/dma/fsldma.c:947:6: warning: unused variable 'size' [-Wunused-variable]
Signed-off-by: NKevin Hao <haokexin@gmail.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/fsldma.c

@@ -944,7 +944,6 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_sg(struct dma_chan *dchan,
 static int fsl_dma_device_terminate_all(struct dma_chan *dchan)
 {
 	struct fsldma_chan *chan;
-	int size;
 
 	if (!dchan)
 		return -EINVAL;