buildroot

configs/freescale: drop unneeded exit statement in post-image scripts

There is no need for the 'exit' statement in the post-image scripts,
so just remove it.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>