[MIPS] rtlx: Fix build error.

  CC      arch/mips/kernel/rtlx.o
cc1: warnings being treated as errors
arch/mips/kernel/rtlx.c:59: warning: 'irq' defined but not used
arch/mips/kernel/rtlx.c:60: warning: 'irq_num' defined but not used
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/rtlx.c

@@ -56,8 +56,6 @@ static struct chan_waitqueues {
 	struct mutex mutex;
 } channel_wqs[RTLX_CHANNELS];
 
-static struct irqaction irq;
-static int irq_num;
 static struct vpe_notifications notify;
 static int sp_stopping = 0;