media: v4l2-ioctl.c: OR flags in v4l_fill_fmtdesc(), not don't overwrite

If a driver sets a FMT flag in the enum_fmt op, then that will be
ignored since v4l_fill_fmtdesc() overwrites it again.

v4l_fill_fmtdesc() should OR its flag, not overwrite it.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -1395,7 +1395,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 
 	if (descr)
 		WARN_ON(strscpy(fmt->description, descr, sz) < 0);
-	fmt->flags = flags;
+	fmt->flags |= flags;
 }
 
 static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,