We should be testing "hwirq" instead of "irq".  "irq" is unsigned so it's
never less than zero.  Also it's uninitialized.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NSrikanth Thokala <sthokal@xilinx.com>