Pull MFD fixes from Lee Jones:
- Use DMA'able addresses for DMA; rtsx_usb
- Use return value in the correct way; kempld-core
* tag 'mfd-fixes-4.0' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd:
mfd: kempld-core: Fix callback return value check
mfd: rtsx_usb: Prevent DMA from stack