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[PATCH] V4L: fix a compiler warning

Fix the warning:

In file included from /home/lyakh/software/project/24/src/linux-2.6/drivers/media/video/v4l2-subdev.c:29:
linux-2.6/include/media/v4l2-ctrls.h:497: warning: 'struct file' declared inside parameter list
linux-2.6/include/media/v4l2-ctrls.h:497: warning: its scope is only this definition or declaration, which is probably not what you want
linux-2.6/include/media/v4l2-ctrls.h:505: warning: 'struct file' declared inside parameter list

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
 include/media/v4l2-ctrls.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 11e6756..c519841 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -492,6 +492,7 @@ void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
 		struct v4l2_subscribed_event *sev);
+struct file;
 /* Can be used as a vidioc_log_status function that just dumps all controls
    associated with the filehandle. */
 int v4l2_ctrl_log_status(struct file *file, void *fh);

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