media/atomisp: Use lockdep instead of *mutex_is_locked()

The only user of rt_mutex_is_locked() is an anti-pattern, remove it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211302.491442626@linutronix.de

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -1904,8 +1904,8 @@ int __atomisp_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 	dev_dbg(isp->dev, "Stop stream on pad %d for asd%d\n",
 		atomisp_subdev_source_pad(vdev), asd->index);
 
-	BUG_ON(!rt_mutex_is_locked(&isp->mutex));
-	BUG_ON(!mutex_is_locked(&isp->streamoff_mutex));
+	lockdep_assert_held(&isp->mutex);
+	lockdep_assert_held(&isp->streamoff_mutex);
 
 	if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		dev_dbg(isp->dev, "unsupported v4l2 buf type\n");