[media] omap3isp: Fix memory leaks in initialization error paths

Make sure all modules init functions clean up after themselves in case
of error.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reported-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>