The only user of gpmi_nand_exit() is gpmi_nand_remove(). Move its content
to the caller.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: NMarek Vasut <marek.vasut@gmail.com>
Acked-by: NHan Xu <han.xu@nxp.com>