irq: Remove return value from IRQ_CONNECT and IRQ_DIRECT_CONNECT

The return value of the interrupt is never used, so remove the
functionality from the API.  We ripple this change into the
ARCH_IRQ_CONNECT and ARCH_IRQ_DIRECT_CONNECT implementations.  With
this change we can also remove the compound expression as that is
not needed anymore.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
10 files changed