[libunwind] [libunwind][nfc] avoid prototype warning (PR #67250)

[Kazushi Marukawa via cfe-commits]

https://github.com/kaz7 created https://github.com/llvm/llvm-project/pull/67250

Avoid following prototype related warning.

Unwind-sjlj.c:85:75: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]

>From 5c4fbab9e6140cd6a7ec2edfcdb4bcd615a38a89 Mon Sep 17 00:00:00 2001
From: "Kazushi (Jam) Marukawa" <marukawa at nec.com>
Date: Sun, 24 Sep 2023 09:26:15 +0900
Subject: [PATCH] [libunwind][nfc] avoid prototype warning

Avoid following prototype related warning.

Unwind-sjlj.c:85:75: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
---
 libunwind/src/Unwind-sjlj.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libunwind/src/Unwind-sjlj.c b/libunwind/src/Unwind-sjlj.c
index 90a55fd29db1faa..4d9a02699cddd78 100644
--- a/libunwind/src/Unwind-sjlj.c
+++ b/libunwind/src/Unwind-sjlj.c
@@ -82,7 +82,8 @@ struct _Unwind_FunctionContext {
 static _LIBUNWIND_THREAD_LOCAL struct _Unwind_FunctionContext *stack = NULL;
 #endif
 
-static struct _Unwind_FunctionContext *__Unwind_SjLj_GetTopOfFunctionStack() {
+static struct _Unwind_FunctionContext *
+__Unwind_SjLj_GetTopOfFunctionStack(void) {
 #if defined(__APPLE__)
   return _pthread_getspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key);
 #else