static_call: Fix return type of static_call_init

Functions that are passed to early_initcall should be of type
initcall_t, which expects a return type of int. This is not currently an
error but a patch in the Clang LTO series could change that in the
future.

Fixes: 9183c3f9ed71 ("static_call: Add inline static call infrastructure")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/lkml/20200903203053.3411268-17-samitolvanen@google.com/
diff --git a/kernel/static_call.c b/kernel/static_call.c
index f8362b3..84565c2 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -410,12 +410,12 @@ int static_call_text_reserved(void *start, void *end)
 	return __static_call_mod_text_reserved(start, end);
 }
 
-void __init static_call_init(void)
+int __init static_call_init(void)
 {
 	int ret;
 
 	if (static_call_initialized)
-		return;
+		return 0;
 
 	cpus_read_lock();
 	static_call_lock();
@@ -434,6 +434,7 @@ void __init static_call_init(void)
 #ifdef CONFIG_MODULES
 	register_module_notifier(&static_call_module_nb);
 #endif
+	return 0;
 }
 early_initcall(static_call_init);