x86, irq: kill create_irq()

create_irq() will return -1 when fail to allocate.
create_irq_nr() will return 0 when fail to allocate.

it only causes confusing.

And now we don't have user for create_irq().

So remove create_irq() for x86.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>

1 file changed