[PATCH] arm64: kernel: Update the stale comment

[Shaokun Zhang]

Commit af391b15f7b5 ("arm64: kernel: rename __cpu_suspend to keep it aligned with arm")
has used @index instead of @arg, but the comment is stale, update it. 

Cc: Sudeep Holla <sudeep.holla at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org> 
Signed-off-by: Shaokun Zhang <zhangshaokun at hisilicon.com>
---
 arch/arm64/kernel/cpuidle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index b512b5503f6e..03991eeff643 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -29,7 +29,7 @@ int arm_cpuidle_init(unsigned int cpu)
 
 /**
  * arm_cpuidle_suspend() - function to enter a low-power idle state
- * @arg: argument to pass to CPU suspend operations
+ * @index: argument to pass to CPU suspend operations
  *
  * Return: 0 on success, -EOPNOTSUPP if CPU suspend hook not initialized, CPU
  * operations back-end error code otherwise.
-- 
2.7.4