Kinetis-L GPIO: Pin IRQ logic no longer returns the xcpt_t oldhandler.  There value is useless and dangerous after the recent changes to interrupt argument passing.

STM32 Ethernet: Need two work structures so that pending poll work is not lost when an interrupt occurs.

Kinetis GPIO: Pin IRQ logic no longer returns the xcpt_t oldhandler.  There value is useless and dangerous after the recent changes to interrupt argument passing.

STM32/F7/L4: EXTI ALARM function no longer returns the xcpt_t oldhandler.  There value is useless and dangerous after the recent changes to interrupt argument passing.

STM3 L4: EXTI COMP function no longer returns the xcpt_t oldhandler.  There value is useless and dangerous after the recent changes to interrupt argument passing.

STM32/F7/L4: EXOT PVD function no longer returns the xcpt_t oldhandler.  There value is useless and dangerous after the recent changes to interrupt argument passing.

arch_phy_irq:  Now returns int instead of xcpt_t oldhandler.  The oldhandler is useless after the changes to the interrupt argument.  Also access an argument for the PHY interrupt.  phy_notify.c driver changed to exploit new interrupt argument passing.

configs/: All functions that used to return an xcpt_t old handler value, not return NULL.  The oldhandler value is no longer useful with the recent changes to the interrupt argument passing.

Remove unused variable

Approved-by: Gregory Nutt

some simple typos

Approved-by: Gregory Nutt

- fixed a nullptr-dereference on iob_clone

Approved-by: Gregory Nutt

Fix open() a block device with CONFIG_DISABLE_PSEUDOFS_OPERATIONS=y

Approved-by: Gregory Nutt

More build fiexes stm32f7 irqfixes

Approved-by: Gregory Nutt

Merged in david_s5/nuttx-11/david_s5/kinetiskinetis_lpserialc-irq-fix-typeo-1488323540334 (pull request #228)

Kinetis:kinetis_lpserial.c irq fix typo

Approved-by: Gregory Nutt