media: imx-jpeg: Remove unnecessary memset() after dma_alloc_coherent()

The `dma_alloc_coherent()' already zeroes out memory for us, so we don't
need the redundant memset().
Signed-off-by: NJason Wang <wangborong@cdjrlc.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c

@@ -519,7 +519,6 @@ static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg,
 				     GFP_ATOMIC);
 	if (!cfg_stm)
 		goto err;
-	memset(cfg_stm, 0, MXC_JPEG_MAX_CFG_STREAM);
 	jpeg->slot_data[slot].cfg_stream_vaddr = cfg_stm;
 
 skip_alloc: