drivers/mfd/cros_ec_dev.c:415:17: warning: incorrect type in initializer (different base types) 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/kernel/+/b7ec7fb624dfc8d07e722cf2e0e72ff82ebaec7b

commit b7ec7fb624dfc8d07e722cf2e0e72ff82ebaec7b
Author: Guenter Roeck <groeck@chromium.org>
Date: Fri Nov 02 03:35:19 2018

CHROMIUM: low-mem: Fix return type of low_mem_notify_poll

0day complains:

   mm/low-mem-notify.c:35:10: warning: symbol 'low_mem_margin_mb' was not declared. Should it be static?
>> mm/low-mem-notify.c:93:17: warning: incorrect type in initializer (different base types)
   mm/low-mem-notify.c:93:17:    expected restricted __poll_t ( *poll )( ... )
   mm/low-mem-notify.c:93:17:    got unsigned int ( *<noident> )( ... )

Make it happy by using the correct return type. Also, while at it,
declare low_mem_margin_mb as static variable

BUG=chromium:901090
TEST=Check build with static checkers

Change-Id: Ib5fe5d06fdc8ff8a36f5db4c57a69cd40ace567a
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1313588
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>

[modify] https://crrev.com/b7ec7fb624dfc8d07e722cf2e0e72ff82ebaec7b/mm/low-mem-notify.c

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/kernel/+/97eadfb42cdb436943e6534d8fe1730850db14d7

commit 97eadfb42cdb436943e6534d8fe1730850db14d7
Author: Guenter Roeck <groeck@chromium.org>
Date: Tue Nov 27 04:31:16 2018

CHROMIUM: cros_ec: Fix return value from of ec_device_poll

0day complains:

drivers/mfd/cros_ec_dev.c:222:23: warning:
	incorrect type in return expression (different base types)

__poll_t expects EPOLLIN / EPOLLRDNORM instead of POLLIN / POLLRDNORM
as return values. The actual defines are the same, so there is no practical
impact from using the wrong defines, but we should still return values from
the same base types.

BUG=chromium:901090
TEST=Test file with static analyzers

Change-Id: Id128dae3344eb29d1692410c609a3efccaf3633e
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1342685
Reviewed-by: Benson Leung <bleung@chromium.org>

[modify] https://crrev.com/97eadfb42cdb436943e6534d8fe1730850db14d7/drivers/mfd/cros_ec_dev.c