All uses of allocate_irqno() have been removed by
commit 
69a07a41d908 ("MIPS: SGI-IP27: rework HUB interrupts"),
so remove the orphan declaration.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 
 extern void arch_init_irq(void);
 extern void spurious_interrupt(void);
 
-extern int allocate_irqno(void);
-
 /*
  * Before R2 the timer and performance counter interrupts were both fixed to
  * IE7.         Since R2 their number has to be read from the c0_intctl register.