genirq: Fix potential memleak when failing to get irq pm

Obviously we should free action here if irq_chip_pm_get failed.

Fixes: be45beb2: "genirq: Add runtime power management support for IRQ chips"
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Cc: Jon Hunter <jonathanh@nvidia.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Link: http://lkml.kernel.org/r/1471854112-13006-1-git-send-email-shawn.lin@rock-chips.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>