staging: media: imx: Replace list_entry with list_for_each_entry_safe

Challenge suggested by coccinelle.
Replace use of the combination of list_empty() and list_entry() with
list_for_each_entry_safe() to simplify the code.

Issue found using below Coccinelle script.

@@
expression E1;
identifier I1, I2;
type T;
iterator name list_for_each_entry_safe;
@@

T *I1;
+ T *tmp;
...
- while (list_empty(&E1) == 0)
+ list_for_each_entry_safe (I1, tmp, &E1, I2)
{
...when != T *I1;
- I1 = list_entry(E1.next, T, I2);
...
}

Signed-off-by: Sanjana Sanikommu <sanjana99reddy99@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/imx/imx-media-capture.c

@@ -556,6 +556,7 @@ static void capture_stop_streaming(struct vb2_queue *vq)
 {
 	struct capture_priv *priv = vb2_get_drv_priv(vq);
 	struct imx_media_buffer *frame;
+	struct imx_media_buffer *tmp;
 	unsigned long flags;
 	int ret;
 
@@ -570,9 +571,7 @@ static void capture_stop_streaming(struct vb2_queue *vq)
 
 	/* release all active buffers */
 	spin_lock_irqsave(&priv->q_lock, flags);
-	while (!list_empty(&priv->ready_q)) {
-		frame = list_entry(priv->ready_q.next,
-				   struct imx_media_buffer, list);
+	list_for_each_entry_safe(frame, tmp, &priv->ready_q, list) {
 		list_del(&frame->list);
 		vb2_buffer_done(&frame->vbuf.vb2_buf, VB2_BUF_STATE_ERROR);
 	}