lightnvm: centralize permission check for lightnvm ioctl
Currently all functions for handling the lightnvm core ioctl commands do a check for CAP_SYS_ADMIN. Change this to fail early in nvm_ctl_ioctl(), so we don't have to duplicate the permission checks all over. Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NMatias Bjørling <mb@lightnvm.io> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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