media: omap3isp: Remove useless NULL check in omap3isp_stat_config

The omap3isp driver checked whether the second argument (the new
configuration) to the ISP statistics is NULL. This is the pointer to the
user-given argument and is never NULL. Remove the check.

Reported-by: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>