igb_uio: print IRQ as decimal number

igb_uio: print IRQ as decimal number

The kernel uses the '%d' or '%ld' to print irq num.
But igb_uio may use the '%lx', then the log may confuse
the user what irq num has been used. The log is show as
below.

igb_uio 0000:00:03.0: irq 24 for MSI/MSI-X
igb_uio 0000:00:03.0: uio device registered with irq 18

kernel version: 3.10.0-514.16.1.el7

For avoiding to be confused, change the igb_uio irq
print type.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>