kcsan: Fix debugfs initcall return type

clang with CONFIG_LTO_CLANG points out that an initcall function should
return an 'int' due to the changes made to the initcall macros in commit
3578ad11f3 ("init: lto: fix PREL32 relocations"):

kernel/kcsan/debugfs.c:274:15: error: returning 'void' from a function with incompatible result type 'int'
late_initcall(kcsan_debugfs_init);
~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
include/linux/init.h:292:46: note: expanded from macro 'late_initcall'
 #define late_initcall(fn)               __define_initcall(fn, 7)

Fixes: e36299efe7 ("kcsan, debugfs: Move debugfs file creation out of early init")
Cc: stable <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Reviewed-by: Miguel Ojeda <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

kernel/kcsan/debugfs.c

@@ -266,9 +266,10 @@ static const struct file_operations debugfs_ops =
 	.release = single_release
 };
 
-static void __init kcsan_debugfs_init(void)
+static int __init kcsan_debugfs_init(void)
 {
 	debugfs_create_file("kcsan", 0644, NULL, NULL, &debugfs_ops);
+	return 0;
 }
 
 late_initcall(kcsan_debugfs_init);