media: st-hva: hva-h264: use swap macro in hva_h264_encode

Make use of the swap macro and remove unnecessary variable tmp_frame.
This makes the code easier to read and maintain.

This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/sti/hva/hva-h264.c

@@ -999,7 +999,6 @@ static int hva_h264_encode(struct hva_ctx *pctx, struct hva_frame *frame,
 {
 	struct hva_h264_ctx *ctx = (struct hva_h264_ctx *)pctx->priv;
 	struct hva_h264_task *task = (struct hva_h264_task *)ctx->task->vaddr;
-	struct hva_buffer *tmp_frame;
 	u32 stuffing_bytes = 0;
 	int ret = 0;
 
@@ -1023,9 +1022,7 @@ static int hva_h264_encode(struct hva_ctx *pctx, struct hva_frame *frame,
 				       &stream->bytesused);
 
 	/* switch reference & reconstructed frame */
-	tmp_frame = ctx->ref_frame;
-	ctx->ref_frame = ctx->rec_frame;
-	ctx->rec_frame = tmp_frame;
+	swap(ctx->ref_frame, ctx->rec_frame);
 
 	return 0;
 err: