media: uvcvideo: Fixed ktime_t to ns conversion

Commit 828ee8c71950 ("media: uvcvideo: Use ktime_t for timestamps")
changed to use ktime_t for timestamps. Older Kernels use a struct for
ktime_t, which requires the conversion function ktime_to_ns to be used on
some places. With this patch it will compile now also for older Kernel
versions.

Signed-off-by: Jasmin Jessich <jasmin@anw.at>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/uvc/uvc_video.c

@@ -1009,7 +1009,7 @@ static int uvc_video_decode_start(struct uvc_streaming *stream,
 
 		buf->buf.field = V4L2_FIELD_NONE;
 		buf->buf.sequence = stream->sequence;
-		buf->buf.vb2_buf.timestamp = uvc_video_get_time();
+		buf->buf.vb2_buf.timestamp = ktime_to_ns(uvc_video_get_time());
 
 		/* TODO: Handle PTS and SCR. */
 		buf->state = UVC_BUF_STATE_ACTIVE;
@@ -1191,7 +1191,8 @@ static void uvc_video_decode_meta(struct uvc_streaming *stream,
 
 	uvc_trace(UVC_TRACE_FRAME,
 		  "%s(): t-sys %lluns, SOF %u, len %u, flags 0x%x, PTS %u, STC %u frame SOF %u\n",
-		  __func__, time, meta->sof, meta->length, meta->flags,
+		  __func__, ktime_to_ns(time), meta->sof, meta->length,
+		  meta->flags,
 		  has_pts ? *(u32 *)meta->buf : 0,
 		  has_scr ? *(u32 *)scr : 0,
 		  has_scr ? *(u32 *)(scr + 4) & 0x7ff : 0);