[MIPS] Remove redeclarations of setup_irq().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/jmr3927/rbhma3100/setup.c b/arch/mips/jmr3927/rbhma3100/setup.c
index 6d4635d..36d22b9 100644
--- a/arch/mips/jmr3927/rbhma3100/setup.c
+++ b/arch/mips/jmr3927/rbhma3100/setup.c
@@ -40,6 +40,7 @@
 #include <linux/sched.h>
 #include <linux/pci.h>
 #include <linux/ide.h>
+#include <linux/irq.h>
 #include <linux/ioport.h>
 #include <linux/param.h>	/* for HZ */
 #include <linux/delay.h>
@@ -183,7 +184,6 @@
 }
 
 unsigned long jmr3927_do_gettimeoffset(void);
-extern int setup_irq(unsigned int irq, struct irqaction *irqaction);
 
 static void __init jmr3927_timer_setup(struct irqaction *irq)
 {