Simplify the imx219_set_stream() by removing an unneeded goto statement,
and its corresponding error label. The natural flow of the function is
correct.

While at it, drop a useless comment.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>