[PATCH 2/9] riscv: irq: Fix no prototype warning

[Nanyong Sun]

Fix the following W=1 kernel compilation warning:
arch/riscv/kernel/irq.c:19:13: warning: no previous prototype for ‘init_IRQ’ [-Wmissing-prototypes]
   19 | void __init init_IRQ(void)
      |             ^~~~~~~~

Reported-by: Hulk Robot <hulkci at huawei.com>
Signed-off-by: Nanyong Sun <sunnanyong at huawei.com>
---
 arch/riscv/include/asm/irq.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
index 9807ad164015..e4c435509983 100644
--- a/arch/riscv/include/asm/irq.h
+++ b/arch/riscv/include/asm/irq.h
@@ -12,4 +12,6 @@
 
 #include <asm-generic/irq.h>
 
+extern void __init init_IRQ(void);
+
 #endif /* _ASM_RISCV_IRQ_H */
-- 
2.25.1