bcma: return the mips irq number in bcma_core_irq

The irq signal numbers that are send by the cpu are increased by 2 from
the number programmed into the mips core by bcma.
Return the irq number on which the irqs are send in bcma_core_irq() now.

Signed-off-by: Nathan Hintz <nlhintz@hotmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

arch/mips/bcm47xx/serial.c

@@ -62,7 +62,7 @@ static int __init uart8250_init_bcma(void)
 
 		p->mapbase = (unsigned int) bcma_port->regs;
 		p->membase = (void *) bcma_port->regs;
-		p->irq = bcma_port->irq + 2;
+		p->irq = bcma_port->irq;
 		p->uartclk = bcma_port->baud_base;
 		p->regshift = bcma_port->reg_shift;
 		p->iotype = UPIO_MEM;