irq_free_hwirqs() always calls irq_free_descs() with a cnt == 0
which makes it a no-op since the interrupt count to free is
decremented in itself.

Fixes: 7b6ef126Signed-off-by: NKeith Busch <keith.busch@intel.com>
Acked-by: NDavid Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/1404167084-8070-1-git-send-email-keith.busch@intel.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>